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How I Built This $160K/Month Gym App
Starter Story
Sep 9, 2026
Mauro built a gym app that last month made $160,000. What sets him apart is not the product or marketing... but his app development approach. He treats the product like a science experiment: A/B testing, validating features, and only building stuff that moves the needled.This video breaks down how to think like a product management expert, stop guessing, and start building what actually moves the needle.
FREE: iOS App Ideas: https://clickhubspot.com/l6tq
Say hi to Mauro: https://x.com/Mauro_Botanes
Check out Symmetry: https://symmetry.club/
🔔 Follow the Second Channel: @StarterStoryBuild
🏁 We're hiring: starterstory.com/jobs
This video is an educational case study of this founder’s experience. It is not financial advice and does not guarantee any income or results. Every business is different and your results may vary.
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I
launched
Symmetry
a
year
ago
and
now
it's
one
of
the
biggest
names
in
one
of
the
most
saturated
app
markets
This
is
Mauro
he's
22
and
in
just
one
year
he
built
an
app
that
makes
over
160
000
a
month
But
this
isn't
really
a
story
about
the
app
he
built
it's
more
of
a
story
about
how
he
decides
what
to
build
First
we
built
what
we
wanted
terrible
idea
Second
we
built
users
wanted
mediocre
And
now
we
approach
a
methodical
and
scientific
way
of
actually
building
useful
things
Most
builders
just
ship
features
and
hope
they
work
but
Mauro
does
it
differently
He
treats
every
feature
like
a
science
experiment
and
I
think
it's
the
number
one
reason
his
app
is
so
successful
Adding
one
screen
it's
increased
three
percent
retention
and
that's
why
you
have
to
A
B
test
everything
So
I
asked
Mauro
to
come
onto
the
channel
to
break
down
this
entire
approach
and
in
this
episode
we'll
dive
into
the
app
that
he
built
that
makes
over
160
000
a
month
why
most
builders
are
wasting
so
much
time
on
features
that
won't
move
the
needle
and
his
approach
on
how
to
build
apps
the
right
way
in
2026
All
right
let's
dive
in
I'm
Pat
Walls
and
this
is
Starter
Story
All
right
Mauro
Gus
and
I
would
love
to
welcome
you
to
the
Starter
Story
channel
So
tell
us
about
who
you
are
what
app
you
built
and
what's
your
story
So
my
name
is
Mauro
I'm
22
years
old
and
I
like
the
gym
so
much
that
I
built
Symmetry
the
fastest
growing
fitness
app
in
the
Spanish
market
I
launched
Symmetry
like
a
year
ago
and
now
it's
one
of
the
biggest
names
in
one
of
the
most
saturated
app
markets
And
today
I
want
to
share
all
the
tactics
of
how
I
did
it
All
right
Mauro
thanks
for
being
here
Could
you
just
pull
up
your
app
tell
us
what
it
is
who
your
users
are
and
then
pull
up
your
revenue
dashboards
to
show
off
that
this
is
legit
Okay
so
basically
it's
a
gym
tracking
app
so
you
can
track
your
workouts
and
track
your
weight
and
reps
for
different
exercises
And
currently
we
are
in
the
Spanish
markets
mainly
in
Spain
and
Mexico
Okay
so
this
is
our
revenue
cut
dashboard
You
can
see
we're
currently
at
around
160k
monthly
revenue
and
we
currently
have
around
3
million
downloads
both
across
iOS
and
Android
But
what
I
think
is
super
cool
about
what
you
built
is
that
you
built
this
gym
app
but
it's
sort
of
localized
to
Spanish
market
There's
plenty
of
gym
apps
in
the
US
and
then
finding
this
sort
of
niche
This
is
clearly
working
It's
doing
over
160
000
in
revenue
in
the
last
30
days
which
is
cool
And
we're
going
to
talk
all
about
the
growth
But
before
we
do
I
want
to
understand
a
little
bit
about
your
background
Had
you
always
been
building
apps
What's
your
background
How
do
you
get
to
this
point
Growing
up
I
was
actually
obese
and
the
gym
is
what
helped
me
a
lot
The
reason
I
built
Symmetry
was
to
share
this
improvement
I
had
in
my
life
with
others
Before
building
Symmetry
I
was
actually
a
fitness
YouTuber
and
so
were
my
co
founders
And
we
were
like
okay
YouTube
is
good
but
we
want
to
help
more
people
How
can
we
do
this
And
that
is
when
we
joined
together
to
build
Symmetry
All
right
before
we
get
into
some
of
the
stuff
we
want
to
talk
about
when
it
comes
to
like
building
the
product
let's
talk
about
growth
So
maybe
just
give
us
a
little
bit
of
a
sense
of
your
growth
timeline
You
said
you
launched
like
a
year
ago
Talk
to
us
about
your
growth
timeline
in
the
last
year
So
we
launched
on
6th
of
June
of
last
year
So
just
barely
over
a
year
When
we
first
launched
we
had
a
very
small
spike
in
downloads
due
to
our
previous
YouTuber
era
But
then
we
had
to
transform
into
another
acquisition
channel
that
was
reliable
and
scalable
And
over
summer
we
were
trying
to
do
GEC
We
barely
were
at
around
30K
downloads
At
the
end
of
quarter
four
we
did
see
a
slight
increase
but
it
was
in
January
in
Q1
when
we
saw
a
spike
Maybe
people
go
to
the
gym
more
in
January
And
since
then
we've
stabilized
Awesome
And
then
let's
talk
about
some
of
the
tactics
that
you
use
to
grow
I
think
you
just
mentioned
UGC
What
were
some
of
the
main
growth
strategies
you
use
to
grow
this
app
to
over
150
000
a
month
So
first
when
we
launched
we
had
this
YouTube
community
that
we
thought
it
was
going
to
be
really
good
for
growing
the
app
It
wasn't
So
we
started
to
try
new
things
We
went
into
influencer
marketing
Well
it
didn't
work
So
we
tried
other
methods
and
that
is
when
we
found
GEC
We
were
really
good
at
it
and
we
just
did
more
and
better
Okay
so
this
is
our
internal
dashboard
In
the
last
year
we
have
posted
nearly
80
000
videos
We
have
more
than
500
accounts
and
we
have
done
nearly
a
billion
views
in
the
last
year
Something
that
really
works
for
us
is
we
segment
the
videos
into
formats
This
was
a
format
that
works
really
good
for
us
where
you
see
the
lock
screen
of
your
iPhone
with
a
notification
in
this
case
your
girlfriend
leaving
you
and
below
a
symmetry
notification
saying
go
to
the
gym
and
work
out
Well
it
works
so
well
that
we
track
all
of
the
videos
and
we
even
have
sub
formats
to
segment
them
even
more
And
this
video
went
extremely
viral
You
can
see
it
Okay
thanks
for
sharing
all
that
about
how
you
grew
I
think
that's
super
cool
We've
done
a
ton
of
videos
on
UGC
I
don't
think
that's
anything
new
and
you
can
go
and
check
out
a
bunch
bunch
of
the
content
that
they
create
and
see
some
of
the
examples
What
I
actually
thought
was
super
cool
and
we
had
chatted
before
Mauro
is
you
told
me
you
have
sort
of
a
different
approach
to
building
And
when
we
started
digging
into
it
I
thought
it
was
super
cool
because
you
got
this
app
to
160
000
a
month
within
one
year
and
that's
really
really
fast
Usually
you'll
maybe
get
to
30
000
or
50
000
within
a
year
You
did
it
super
fast
and
I
think
one
of
those
reasons
was
you
had
this
sort
of
different
approach
to
building
that
you
shared
with
me
things
just
kind
of
started
working
right
away
So
could
you
share
with
me
that
approach
to
how
you
knew
what
to
build
what
features
to
build
Yeah
so
we
went
through
three
different
phases
when
building
Symmetry
First
we
built
what
we
wanted
Terrible
idea
Second
we
built
what
users
wanted
directly
from
feedback
requests
Mediocre
And
now
we
approach
a
methodical
scientific
way
of
actually
building
useful
things
Okay
yeah
so
I
agree
I
mean
I
see
a
lot
of
or
maybe
they
build
based
on
instincts
but
yours
is
a
little
different
Could
you
dive
a
little
bit
more
into
what
you
mean
by
that
Yeah
so
people
normally
are
incorrect
about
what
is
important
to
build
and
what
is
not
important
Let's
say
you
build
a
dark
theme
or
a
light
theme
This
may
affect
like
2
of
your
daily
active
users
whereas
if
you
A
B
test
the
paywall
it's
going
to
affect
a
lot
of
users
in
a
radical
way
That's
why
there
are
even
softwares
just
to
A
B
test
at
one
screen
And
apart
from
the
paywall
there
are
very
other
important
places
of
your
app
and
your
job
is
to
find
those
places
and
A
B
test
them
and
really
exploit
all
of
the
metrics
from
them
For
example
in
Symmetry
our
exercise
search
screen
so
the
screen
you
search
exercises
has
a
huge
impact
on
activation
and
retention
Whereas
the
screen
you
log
into
the
app
first
to
see
your
workouts
we've
done
a
lot
of
things
there
and
it
doesn't
seem
to
change
anything
Hey
it's
Gus
producer
producer
here
at
Star
Story
I
love
everything
that
Mauro
is
breaking
down
about
his
process
of
building
building
apps
I
hope
you're
watching
this
and
getting
excited
about
building
your
own
app
as
well
But
if
you're
still
looking
for
an
idea
we
have
just
the
thing
for
you
It's
our
free
iOS
database
and
inside
you
will
find
hundreds
of
proven
app
ideas
and
many
of
them
are
making
over
10
000
a
month
And
each
of
the
ideas
in
the
database
has
the
numbers
to
back
it
up
Real
revenue
pricing
models
growth
tactics
basically
everything
you
need
to
validate
whether
this
is
a
good
idea
or
not
Just
head
to
the
link
in
the
description
and
grab
this
database
It's
100
for
free
All
right
let's
get
back
to
the
episode
Okay
so
you
kind
of
approach
the
features
to
work
on
or
to
improve
on
like
what
most
people
are
using
instead
of
focusing
on
maybe
like
more
edge
cases
Tell
me
a
little
bit
more
about
how
you
track
that
sort
of
thing
and
like
how
someone
watching
this
could
potentially
do
the
same
So
first
you
want
to
decide
what
metrics
to
actually
move
For
me
I
use
quarterly
OKRs
and
put
really
ambitious
OKRs
If
your
app
is
really
new
put
ambitious
OKRs
Like
it's
very
easy
to
increase
10
conversion
rate
in
90
days
if
your
app
was
launched
last
week
Whereas
if
you're
Netflix
it's
not
going
to
be
as
easy
So
the
earlier
the
product
is
the
more
ambitious
your
OKRs
have
to
be
For
example
in
our
case
we
call
this
thing
a
warm
up
which
we
do
every
90
days
because
we're
going
to
work
Here
you
have
your
marketing
objectives
your
product
and
then
here
we
have
all
of
the
metrics
to
keep
track
and
we
see
them
if
not
weekly
daily
to
make
sure
we
are
always
on
track
towards
these
OKRs
OKRs
are
very
important
to
give
you
direction
and
to
know
towards
where
to
build
For
a
gym
tracking
app
a
very
important
metric
is
If
you
move
activation
retention
follows
For
example
activation
in
symmetry
is
really
hard
because
you
have
to
make
someone
go
to
the
gym
and
actually
track
a
workout
which
is
crazy
friction
even
both
for
a
beginner
that
has
never
been
to
a
gym
or
someone
advanced
that
you
have
to
change
his
behavior
his
pattern
of
working
out
Crazy
work
Whereas
for
example
in
a
calorie
tracking
app
you
just
snap
a
photo
and
that's
activation
So
you
must
know
which
metrics
you
want
to
move
and
which
ones
are
going
to
bring
long
term
revenue
Okay
cool
I
mean
having
OKRs
that
your
team
can
go
towards
and
know
if
I
built
this
feature
that
made
this
number
go
up
or
I
built
built
that
feature
then
you
have
actual
data
that
you
can
verify
I'm
curious
though
like
for
people
watching
this
that
are
also
building
apps
what
are
like
the
key
data
points
that
you
are
tracking
Well
first
of
all
especially
if
you're
new
downloads
like
the
more
downloads
the
more
revenue
is
proportional
So
that's
very
important
Regarding
what's
the
product
depends
on
your
product
Activation
in
our
case
is
very
important
but
for
most
apps
first
week
retention
or
30
day
retentions
are
very
important
And
also
a
very
important
number
is
ARPU
average
revenue
per
user
how
much
you
make
for
every
download
This
is
going
to
basically
decide
the
amount
of
money
you
can
pay
for
creators
if
they
bring
downloads
And
ARPU
varies
a
lot
between
countries
So
you
abstract
this
in
a
very
methodical
way
I
think
a
lot
of
people
watching
this
are
also
building
something
They're
building
an
app
Maybe
they
even
have
a
live
app
in
the
app
store
or
they
have
a
SaaS
on
the
Internet
I
think
this
framework
is
really
cool
where
you're
actually
using
data
and
then
making
decisions
based
on
that
data
Could
you
give
some
advice
to
people
who
are
watching
this
right
now
who
want
to
implement
a
system
like
this
What
data
should
they
be
tracking
How
should
they
be
running
experiments
And
what
would
you
do
if
you're
just
getting
started
right
now
Well
first
the
most
common
error
I
see
everybody's
not
tracking
anything
like
they
don't
have
any
events
at
all
in
their
app
And
I'm
like
OK
what's
your
drop
off
here
And
they're
like
um
I
don't
know
Well
you
must
have
analytics
put
in
your
app
everywhere
The
earlier
they
are
in
the
funnel
the
more
in
detail
there
should
be
So
onboarding
must
be
tracked
every
screen
These
analytics
are
very
good
for
quantitative
data
meaning
you
know
where
you're
losing
people
So
that
tells
you
where
the
problem
is
happening
but
not
the
why
For
the
why
you
need
qualitative
data
Here
you
speak
with
the
users
or
they
maybe
put
up
posts
in
like
a
Discord
or
a
Reddit
about
your
app
something
like
that
And
then
you
understand
why
something
is
happening
So
know
what
is
happening
due
to
the
funnels
and
the
data
analytics
And
then
you
know
the
why
because
you
speak
with
the
users
Yeah
this
is
something
super
common
that
I'll
see
people
who
are
like
developers
They're
like
want
to
just
get
only
qualitative
data
And
then
they
end
up
like
sending
a
bunch
of
surveys
and
not
actually
like
talking
to
customers
And
there's
so
much
value
you
can
get
out
of
talking
to
customers
The
last
question
that
I
sort
of
have
around
this
is
around
OK
so
when
you
need
to
make
a
product
decision
how
do
you
go
about
A
B
testing
two
different
things
How
do
you
track
that
How
do
you
think
about
it
OK
first
you're
not
coming
from
a
solution
place
You
must
come
from
a
problem
space
So
coming
up
with
problems
And
And
then
after
you
go
for
the
solution
here
you
come
up
with
different
hypotheses
different
solutions
and
you
design
experiments
to
test
these
hypotheses
So
first
what
problem
am
I
solving
How
do
I
know
it's
real
You
must
know
if
this
is
happening
And
then
what's
the
solution
and
the
hypothesis
How
much
will
each
hypothesis
move
the
metric
Are
there
any
guardrail
metrics
I
should
watch
out
And
then
also
very
important
you
must
A
B
test
everything
You
have
your
control
version
the
version
of
your
app
currently
and
the
new
version
being
A
B
tested
And
after
at
least
two
weeks
of
running
the
experiment
you
then
analyze
the
data
and
really
know
what
is
happening
to
the
users
For
example
this
is
what
we
call
Evelyn
Experiment
Velocity
Engine
Listing
Your
Numbers
Here
we
have
all
of
our
A
B
test
tracks
This
is
a
database
that
comes
from
user
interviews
So
it's
user
interviews
that
show
us
the
user
problem
Then
we
do
the
These
experiments
are
being
tracked
in
Puzzle
So
here
we
track
everything
and
we
can
see
how
everything
is
running
For
example
this
was
an
experiment
I
mentioned
earlier
about
the
page
you
see
see
after
the
onboarding
where
you
see
your
workouts
You
see
here
we
tested
two
different
variants
apart
from
the
control
and
they
moved
nothing
the
metrics
absolutely
nothing
And
they
were
completely
different
designs
This
tells
us
hey
let's
not
focus
on
here
again
This
is
an
inconclusive
test
Let's
focus
on
other
areas
of
the
app
For
example
this
experiment
is
just
one
screen
at
the
end
of
the
onboarding
where
you
commit
to
like
workout
So
you're
like
signing
hey
I'm
going
to
work
out
That's
it
One
screen
Just
look
at
how
the
metrics
move
It's
increased
3
retention
adding
one
screen
That
is
why
you
have
to
A
B
test
everything
Yeah
I
was
just
going
to
chime
in
with
a
quick
thought
which
was
like
I
didn't
start
building
anything
until
all
these
AI
coding
tools
came
out
And
I
definitely
fall
into
the
trap
of
like
oh
that
would
be
cool
That'd
be
cool
if
it
existed
without
any
information
And
so
listening
to
you
talk
here
I'm
like
okay
there's
a
lot
of
good
things
to
keep
in
mind
Cool
Let's
switch
topics
a
little
bit
So
you
talked
to
us
about
all
the
things
you
analyze
and
all
the
tools
you
use
Maybe
just
walk
us
through
the
tech
stack
you've
used
to
build
this
app
or
the
tech
stack
and
tools
you
use
on
a
daily
basis
to
run
this
app
Well
obviously
I
use
me
and
my
team
we
use
cloud
everywhere
We
love
to
use
cloud
with
MCPs
and
we
connect
to
this
analytics
tool
like
PostHoc
or
Superwall
RemedyCat
with
MCP
and
see
all
our
data
from
there
I
also
use
WhisperFlow
a
lot
I
like
to
speak
with
my
computer
and
that
way
I'm
faster
than
typing
Also
for
A
B
testing
the
paywalls
we
use
Superwall
They
have
really
good
experimentation
tools
For
A
B
testing
we
use
PostHoc
Then
we
use
Notion
to
track
all
of
of
our
documentation
and
Slack
to
speak
with
the
team
And
that's
pretty
much
it
Okay
Thanks
for
sharing
tech
stack
I'm
also
curious
we've
been
talking
all
about
your
app
here
Could
you
just
give
me
a
quick
demo
of
your
app
that
makes
over
160
000
a
month
Yeah
So
our
app
we
try
to
make
it
really
simple
So
the
first
thing
you
see
when
you
come
just
like
your
plan
to
work
out
you
click
on
the
plan
and
you
see
a
workout
preview
and
then
you
start
your
workout
Here
you
can
track
your
weights
your
reps
and
we
even
have
like
videos
to
explain
different
exercises
And
then
the
thing
that
people
most
like
is
here
the
ranks
You're
seeing
the
ranks
page
where
you
have
a
rank
for
every
muscle
group
and
for
every
exercise
And
also
here
you
have
the
social
network
So
it's
like
a
Strava
You
can
see
here
all
of
the
people
in
the
feed
uploading
their
workouts
I
even
have
my
own
workouts
here
So
it's
really
fun
because
people
share
their
workouts
You
have
your
streak
You
cannot
lose
your
streak
to
your
friends
You
level
up
in
different
exercises
and
people
just
are
having
a
really
great
time
Okay
Thanks
for
sharing
It
looks
like
an
awesome
app
Last
question
that
we
ask
all
founders
to
come
on
to
Starter
Story
If
you
could
go
back
in
time
before
the
year
that
you
started
Symmetry
before
you
had
a
successful
app
what
would
be
your
advice
to
your
younger
self
or
for
anyone
watching
this
that
wants
to
build
apps
that
are
crushing
it
like
yours
I
would
say
to
play
long
term
games
with
long
term
people
Symmetry
was
launched
one
year
ago
but
we
actually
started
the
company
two
years
ago
We
were
really
bad
when
we
started
but
we
never
surrendered
and
we
just
kept
pushing
kept
improving
the
product
kept
improving
our
own
skills
And
if
you're
with
people
that
are
here
for
the
long
term
10
plus
years
it's
just
a
matter
of
time
that
you'll
make
it
too
That's
great
advice
Thank
you
Mauro
for
coming
on
the
channel
Love
what
you
built
Congrats
Massive
success
even
after
just
a
year
of
launching
I
think
people
are
going
going
to
love
this
one
So
thanks
for
coming
on
Thanks
for
having
me
Pat
It's
my
pleasure
to
be
here
All
right
Gus
the
new
co
host
of
Starter
Story
First
of
all
welcome
How
was
your
first
interview
being
on
camera
for
the
first
time
First
off
for
anyone
watching
or
still
watching
this
be
kind
to
me
You
won't
see
this
in
the
the
take
but
I
definitely
had
a
double
take
when
I
asked
that
first
question
And
so
for
anyone
watching
who
thinks
this
is
easy
not
easy
Pat
is
a
pro
Yeah
What
did
I
think
of
the
video
It
really
stood
out
to
me
the
whole
run
experiments
thing
because
like
I
mentioned
maybe
in
the
interview
if
it
makes
it
into
the
cut
most
of
my
product
decisions
have
been
like
oh
that
sounds
cool
I
wish
I
could
build
that
or
I
should
just
build
that
with
zero
data
zero
information
That's
kind
of
my
first
thought
is
like
oh
a
lot
goes
into
all
these
apps
more
than
just
like
what
cool
feature
should
I
build
Yeah
no
I
mean
this
is
sometimes
I
think
people
online
talk
about
building
apps
and
like
oh
you
just
prompt
cloud
code
or
whatever
How
real
companies
actually
build
product
is
very
data
based
and
very
analytical
And
I
think
that
it's
sort
of
like
nice
to
know
that
if
you
want
to
make
a
change
in
your
app
you
know
that
if
you
can
run
a
test
it
doesn't
work
Just
turn
that
test
off
Once
you
have
enough
users
I
think
that's
the
right
way
to
approach
building
anything
Yeah
I'm
curious
You're
really
data
driven
like
analytical
whether
it's
with
Star
Story
or
something
else
Like
I
think
someone
watching
might
think
like
how
much
do
these
really
move
the
needle
You
know
clearly
he
told
me
he
gave
us
a
good
example
of
one
that
didn't
matter
or
did
matter
But
like
in
your
experience
what's
that
been
like
for
you
I
guess
that's
I'm
curious
Most
of
the
tests
that
you
run
and
the
things
things
that
you
try
don't
move
the
needle
at
all
And
I
think
just
doing
those
and
seeing
that
knowing
that
those
things
don't
matter
is
like
really
powerful
so
that
the
next
time
you
go
and
someone
says
let's
change
the
planning
page
or
let's
update
this
settings
page
or
whatever
things
that
don't
matter
You
already
know
like
obviously
you
don't
want
to
ever
make
too
many
assumptions
but
you
already
know
like
hey
that's
probably
not
going
to
have
a
huge
impact
I
actually
know
the
things
that
are
probably
going
to
have
an
impact
And
then
you
start
building
your
sense
around
what
to
even
test
So
most
things
don't
make
a
difference
And
I
think
just
knowing
that
is
good
to
know
that
hey
maybe
focus
more
on
marketing
than
product
often
but
having
the
tools
and
the
tool
set
to
know
how
to
make
changes
and
how
to
track
those
changes
I
think
is
really
powerful
All
right
guys
we'll
see
in
the
next
one
Peace
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