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90 FIT: a personal training app that turns every session into measurable progress

Resourcifi built 90 FIT, a native fitness app that pairs structured workout programs with real time tracking, a clear daily nutrition picture, and motivational insights that keep members on plan.

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Industry

Fitness & Wellness

Engagement

Project Build

Platform

iOS, Android

Services delivered

7 workstreams

Timeline

Focused build cycle with structured beta and launch phases.

The challenge

What 90 FIT needed to solve.

90 FIT wanted members to do more than open a workout app, it wanted them to finish what they started. The product had to combine guided programs, live calorie and nutrition tracking, and progress that reads at a glance, all in one place that members would return to every day.

Goals

Combine structured programs with daily tracking in one app
Make calories, macros, and goals readable at a glance
Guide members through each set and rep with timers
Personalize plans to each member's level and equipment
Keep members on plan with progress and motivation

The solution

Resourcifi built 90 FIT as a native app with a clean light interface and a focused dark summary card for the daily numbers. The home screen rolls statistics and workout video cards together, a nutrition view tracks calories and macros against a goal, and guided workout and progress screens close the loop on every session.

What we built

The 90 FIT build, screen by screen.

01 · Daily home

Statistics and workouts in one view

The home screen opens on a greeting with points, a weekly statistics chart, and workout cards with video thumbnails ready to begin.

Calories and time at a glance
Tan and orange weekly bars
Workout cards with video play
My equipment row below

SwiftKotlin

9:41

Alex Johnes

352 points

🔔

StatisticsJanuary ▾

Calories

160.5 kcal

Time

1:03:30

MonTueWedThuFriSatSun

WorkoutsView all

My workoutsSuggestedPopular

▶

Rope Waves

Battle ropes

▶

Smith Squats

Smith machine

My equipmentView all

02 · Today and nutrition

A daily summary that reads in seconds

The Today view holds a dark summary card with a big calories remaining ring and macro mini rings, plus stat tiles and workout goal progress.

2540 calories remaining ring
Carbs, protein, and fat rings
Intake, burn, and water tiles
Workout goals with percent rings

Cloud BackendHealthKit

9:41

Today☰

‹Week 4›

SummaryDetails

2540Remaining

Carbs

142/327g

Protein

74/145g

Fat

24/79g

1720kcal intake

-287kcal burned

3 / 4 Lwater

Workout goalsSee more

💪

Arm & shoulder muscle

3 of 7 sessions

42%

✊

Hand grip muscle

5 of 7 sessions

68%

03 · Workout detail

Every set and rep laid out in order

Each workout lists its moves with sets and reps and the equipment it needs, so a member sees the whole session before starting.

Moves in training order
Sets and reps per move
Equipment shown per exercise
One tap to begin

Program engineCloud Backend

9:42

‹

Upper Body Strength

6 moves · 45 min · Intermediate

ExercisesWarm upNotes

Rope Waves

Battle ropes

3 x 30s

Smith Squats

Smith machine

4 x 10

Bench Press

Adjustable bench

4 x 8

Shoulder Press

Dumbbells

3 x 12

Bent Over Rows

Barbell

3 x 10

Plank Hold

Bodyweight core

3 x 45s

Start workout

04 · Active workout

A timer that runs every set

During a session a countdown ring runs the current set while the next move waits below, with elapsed time and calories in view.

Countdown ring per set
Current set and next up
Elapsed time and calories
Pause and resume

Interactive timersSwift

9:43

‹

Smith Squats

Set 2 of 4, keep a steady tempo

0:38Rest

2/4Sets

12:46Elapsed

184Cal

Up next

Bench Press

Adjustable bench

4 x 8

Skip

Pause

05 · Progress and trends

Progress that reads in plain numbers

Weekly volume, a training streak, and goal completion roll up together, with HealthKit vitals alongside so the full picture stays in one place.

Weekly volume bars
Training streak total
Goal completion ring
HealthKit vitals synced

Real Time AnalyticsHealthKit

9:44

Progress

This weekMonthAll time

12Day streak

5Sessions

248Minutes

Weekly volume

MTWTFSS

Goal completion

55 percent of weekly goals met

55%

Synced from HealthKit

Resting heart rate62 bpm

Active energy412 kcal

Steps today8,940

06 · Profile and plan

Plan, goals, and connected apps

Members manage their plan, daily calorie goal, connected apps, and subscription from one profile that stays synced across devices.

Current plan and level
Daily calorie goal
Connected app controls
Subscription management

Cloud BackendCross device sync

9:45

Edit

Alex Johnes

12 day streak · intermediate plan

352 points90 FIT Pro

My plan

Intermediate, 5 days a week

›

Daily calorie goal

2540 kcal target

›

Connected apps

Apple Health connected

›

Subscription

90 FIT Pro, monthly

›

How we worked

From discovery to a production build.

Discovery

map the program library and tracking model with the 90 FIT team

Design

shape the light interface and the dark daily summary card

Build

ship the native apps, program engine, and tracking together

Integration

connect HealthKit, nutrition data, and analytics

Release

launch on both stores and iterate on completion rates

Resourcifi engineers building the 90 FIT mobile app

The stack

What 90 FIT runs on.

Mobile

Swift

Native iOS app and guided timers

Mobile

Kotlin

Native Android app at feature parity

Platform

Cloud Backend

Programs, nutrition, and member data

Data

HealthKit and Real Time Analytics

Vitals sync and live progress tracking

Related case studies

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90 FIT: a personal training app that turns every session into measurable progress

What 90 FIT needed to solve.

The 90 FIT build, screen by screen.

Statistics and workouts in one view

A daily summary that reads in seconds

Every set and rep laid out in order

A timer that runs every set

Smith Squats

Progress that reads in plain numbers

Progress

Plan, goals, and connected apps

From discovery to a production build.

Discovery

Design

Build

Integration

Release

What 90 FIT runs on.

Swift

Kotlin

Cloud Backend

HealthKit and Real Time Analytics

GYMGUYZ

Fit in 7

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FitFiends

Talk to our fitness app team.