Product Design · Engineering · Case Study

FIIT — Transforming Fitness Through Technology

A connected, hybrid fitness platform that turns any screen into a studio.

FIIT is the UK's #1 rated hybrid fitness platform, streaming on-demand and live group workouts across mobile, web, tablet and Smart TV. Launched in 2017–18, it has grown into a cross-device fitness ecosystem spanning 2,000+ classes, 40+ trainers and a connected-hardware ecosystem that turns reps, heart rate and calories into a live, gamified leaderboard.

Industry: Health & Fitness Platforms: Web · iOS · Android · Smart TV Model: Freemium + Subscription HQ: London, UK
20M+
Workouts completed
175+
Markets worldwide
4.9 / 5
From 45K+ App Store reviews
2,000+
On-demand classes

Trusted by startups, growing businesses, and enterprise clients worldwide

Theralieve Stablish Hibotalk Neon_Cow_Boys Eco Mobility Shozon Fiit Theralieve Stablish Hibotalk Neon_Cow_Boys Eco Mobility Shozon Fiit
01 · Project Overview

One workout platform, every screen in the house

FIIT collapses the gap between gym, studio and living room — letting members train on whichever device is closest, with their progress following them everywhere.

🎯

What the platform does

FIIT streams thousands of on-demand classes plus scheduled live "Group Workouts" across 7 disciplines (Strength, Cardio, Rebalance, Bike, Tread, Row, Airbike) and 20+ modalities — from 10-minute bodyweight movers to 60-minute yoga flows and structured 12-week training plans.

👥

Target audience

Home-workout beginners who want studio energy without a commute, hybrid gym members who train both in-club and at home, and performance-driven users who want HR, rep-count and leaderboard data layered onto every session.

💻

Platforms

iOS & Android apps, a browser app at web.fiit.tv, and native Smart TV apps for Samsung TVs, Amazon Fire TV, Sky Q and Comcast/Xfinity (also distributed via Rogers and Shaw in Canada) — one account, synced everywhere.

🔗

Hardware ecosystem

A companion FIIT Tracker chest strap plus compatibility with 30+ third-party heart-rate monitors and wearables (Apple Watch, WHOOP, Wahoo Tickr X and others) feed live BPM, rep counts and FIIT Points into the workout player.

02 · Business Objectives

Four problems the product had to solve at once

🔥

Engagement

Replace gym habit-loops with daily, scheduled Group Workouts and a points/leaderboard system so users keep showing up.

📈

Subscription growth

Convert a free, no-card scheduled-class tier into paid Essential/Unlimited members via a clear value ladder.

🧠

Personalisation

Match 40+ structured training plans and class recommendations to a member's goals, equipment and fitness level.

🌍

Scalability

Serve 175+ markets across mobile, web and Smart TV operating systems without fragmenting the experience.

03 · Key Features

What members actually use, week to week

🎬

On-demand workouts

2,000+ classes across Strength, Cardio and Rebalance studios in 10/25/40/60-minute formats, filterable by equipment (bodyweight, dumbbell, kettlebell, bike, rower, treadmill, airbike).

📡

Live Group Workouts

Scheduled classes roughly every half hour that members join free of charge — designed to recreate studio accountability; live "Club" sessions report users pushing noticeably harder than solo.

🗺️

Training plans

40+ multi-week programmes spanning beginner to advanced, built from the same class library so progress compounds rather than resets every session.

📊

Progress tracking

Live dashboard of BPM, calories, FIIT Points, RPM and rep counts during class, captured via the FIIT Tracker or any of 30+ compatible HR monitors.

🏆

Gamification & community

Live leaderboards, monthly Challenges, Teams and "Game Day" group classes that turn workouts into friendly competition with friends, colleagues or strangers.

🔄

Multi-device sync

One account follows the member from phone to browser to Smart TV, with class history, plans and tracker data synced across every screen.

🩺

Health integrations

Two-way sync with Apple Health and Google Health, plus Spotify for in-class music — and Unlimited members get a bundled Men's & Women's Health magazine subscription.

💳

Tiered membership

Free (scheduled Group Workouts only), Essential and Unlimited ($9.99/mo or $119.99/yr) tiers, each unlocking more of the on-demand library and tracker features.

🛍️

FIIT Perks & shop

Partner discounts for Unlimited members and a direct-to-consumer shop selling the FIIT Tracker and branded kit.

04 · Web App User Flow

From landing page to logged workout

The web app (web.fiit.tv) mirrors the mobile experience but is optimised for browsing the full class catalogue on a larger screen before pairing with a tracker for the actual session.

1

Landing Page

Autoplay hero video, live stat counters (workouts completed, downloads, markets), a 14-day free trial CTA and "use on every device" badges for iOS, Android, Sky, Samsung and Fire TV.

2

Sign Up / Login

Email or social sign-in, plan selection (Free / Essential / Unlimited), trial terms disclosure, and an option to pair a tracker later rather than blocking onboarding.

3

Dashboard

"Today's Group Workouts" rail, continue-watching row, weekly streak/points summary, and a shortcut into the member's active training plan.

4

Browse Programs

Filterable grid by studio (Strength/Cardio/Rebalance), equipment, duration and trainer, plus a dedicated Training Plans tab for structured 4–12 week programmes.

5

Program Details

Trainer bio, class breakdown, equipment needed, difficulty rating, and member reviews before pressing play or scheduling into a Group session.

6

Workout Player

Full-screen video with a live overlay for BPM, FIIT Points, rep count and a leaderboard sidebar in Group/Club sessions; pause, rewind and trainer cues remain accessible mid-class.

7

Progress Tracking

Post-class summary (calories, BPM zones, points earned) rolling up into a weekly/monthly analytics view and training-plan completion bar.

8

Subscription & Payments

Plan comparison table (Free / Essential / Unlimited), monthly vs. annual toggle, secure checkout, and self-serve upgrade/cancel management.

05 · Mobile App Flow (iOS + Android)

Designed for the 2x2 metre living-room workout

The mobile app is the primary entry point for most members — it has to work with one finger, a sweaty screen, and a phone propped against a wall.

👋

Onboarding

Goal selection (lose weight, build strength, train for an event), equipment check, and tracker pairing prompt — skippable so free users reach a workout in under a minute.

🏠

Home feed

"Next Group Workout" countdown, recommended classes based on recent activity, and an active training-plan progress card pinned to the top.

▶️

Workout player

Portrait or landscape video, on-screen rep/BPM overlay, picture-in-picture support so the class stays visible while checking form notes.

🟢

Live session

Real-time leaderboard with FIIT Points, chat-free "wave" reactions, and synced countdown so everyone in a scheduled class starts together.

🔔

Notifications

Class-starting-soon reminders, streak-at-risk nudges, Challenge updates, and friend activity pings — tuned to motivate without becoming noise.

📴

Offline mode

Downloaded classes for gym floors or flights with patchy connectivity, with progress and stats queued to sync once back online.

06 · UI/UX Design System

Built for sweat, not subtlety

A dark canvas keeps video content the visual hero; one neon accent does all the heavy lifting for CTAs, live data and motivation cues.

Color palette

Charcoal BG
#0B0D10
Signal Lime
#C6FF3D
Heat Orange
#FF5E3A
Pulse Blue
#3DA9FF
Card Surface
#161B21

Lime signals primary action and live/positive states (points, streaks); orange flags intensity and challenges; blue is reserved for informational data like heart-rate zones.

Typography & principles

Display
Train Harder
Heading
Today's Workouts
Body
25-minute strength class, intermediate level, dumbbells required.
Caption
142 BPM · 320 KCAL · #4 ON LEADERBOARD

UX principles: low-friction entry (free tier needs no card), engagement-first surfaces (streaks, leaderboards, countdowns), and one-thumb operability for sweaty, mid-workout interactions.

07 · Technical Architecture

Engineering blueprint for a multi-device fitness platform

FIIT does not publish its internal stack. What follows is an architecture pattern representative of how a platform with FIIT's surface area — live video, wearable telemetry, real-time leaderboards, six-plus device targets — is typically engineered, written for a CTO-level review rather than as a claim about FIIT's actual codebase.

Client Layer
Native iOS Android Swift Objective-C Kotlin React Js
↓
Edge & Delivery
CDN API Gateway WAF
↓
Data Layer
MongoDB Node.js
↓
Server
Amazon EC2 AWS Lambda Amazon S3 Amazon EBS AWS IAM Amazon CloudWatch
↓
Hardware Integration
CoreBluetooth ESP32 MQTT AWS IoT Core

Why microservices: live leaderboard traffic spikes hard for ~30 minutes per scheduled class then drops to near-zero — isolating that service lets it scale independently of billing or catalogue browsing, which have flatter, predictable load.

08 · Third-Party Integrations

What the platform plugs into

IntegrationPurpose
Apple Health & Google HealthTwo-way sync of workout, calorie and heart-rate data with platform health stores
30+ wearables (Apple Watch, WHOOP, Wahoo Tickr X, FIIT Tracker)Real-time heart rate, rep counting and calorie data feeding the live workout HUD
SpotifyIn-class music streaming synced to trainer playlists
Smart TV platforms (Samsung, Fire TV, Sky Q, Comcast/Xfinity, Rogers, Shaw)Native big-screen distribution beyond mobile and web
Payment processingRecurring monthly/annual subscription billing for Essential and Unlimited tiers
Men's Health / Women's Health (Hearst)Bundled digital magazine subscription for Unlimited members
09–10 · Challenges & Solutions

What's genuinely hard about building this

Challenge

Streaming studio-quality video reliably to phones, browsers and six-plus Smart TV platforms at once, across 175+ markets with wildly different bandwidth.

Solution

CDN-backed adaptive bitrate (HLS) delivery that renegotiates quality per device and connection, with platform-specific players for each TV SDK.

Challenge

Live Group Workouts and leaderboards need sub-second telemetry from thousands of concurrent trackers without becoming the bottleneck for the rest of the platform.

Solution

A dedicated, independently-scaled telemetry/leaderboard service using an in-memory store (Redis) and a pub/sub layer, isolated from billing and catalogue services.

Challenge

Recommending the right class or training plan out of 2,000+ options, for users ranging from total beginners to advanced athletes.

Solution

A recommendation layer blending stated goals, equipment availability and completed-class history, re-ranked weekly as new classes are added.

Challenge

Keeping the experience consistent across iOS, Android, web and four-plus Smart TV ecosystems with very different input models (touch vs. remote).

Solution

A shared design system and content API consumed by every client, with platform-specific navigation shells (remote-friendly TV nav vs. touch-first mobile nav).

11 · Results & Impact

What the numbers say

Publicly reported figures from FIIT, shown alongside the engagement pattern they imply for a hybrid fitness platform.

20M+
Workouts completed since launch
175+
Markets reached worldwide
4.9/5
Across 45K+ App Store & 5K+ Google Play reviews
22%
Harder average effort reported in live "Club" classes vs. solo
12–13 · Creative Image Generation Prompts

Visual prompt library for this case study

Ten ready-to-use prompts for generating portfolio-grade mockups, in a consistent dark / neon-lime fitness-SaaS visual language.

Web DashboardModern fitness SaaS web dashboard, dark charcoal theme, neon lime-green accent charts, workout card carousel, sidebar navigation, clean enterprise UX, 4K UI mockup, Dribbble quality
Workout PlayerFull-screen fitness video player UI, trainer mid-exercise, live heart-rate and calorie HUD overlay, leaderboard sidebar with avatars, dark cinematic broadcast-style interface
Mobile App HomeiOS fitness app home screen, dark UI, countdown card for next live class, recommended workouts carousel, bottom tab bar, neon green accent, premium app store screenshot style
Progress AnalyticsFitness progress analytics screen, dark theme, line chart of heart-rate trend, bar chart of weekly calories, streak calendar grid, lime and orange accent data visualization
System Architecture DiagramClean technical system architecture diagram, dark background, labeled boxes for API gateway, microservices, databases and CDN, connecting arrows, neon accent lines, engineering whiteboard style
User Flow DiagramUX user flow diagram, dark canvas, numbered circular step nodes connected by arrows, from landing page to checkout, minimalist wireframe style, neon green highlight path
Subscription ScreenSaaS pricing page UI, three tiered plan cards on dark background, neon "best value" badge, monthly/yearly toggle, checkmark feature lists, premium fintech-grade design
Live LeaderboardIn-app live leaderboard overlay, dark UI, ranked list of user avatars with scores and rank-change arrows, neon green highlight for current user, real-time competitive fitness UI
Onboarding FlowMobile app onboarding screens, dark theme, goal-selection cards with icons, progress dot indicator, equipment checklist screen, clean modern fitness app design
Smart TV InterfaceSmart TV fitness app interface, 16:9 dark UI, large remote-friendly focus states, horizontal class carousel, big-screen typography, living room streaming app aesthetic
FIIT PRODUCT ECOSYSTEM ONE ACCOUNT. EVERY SCREEN. Mobile · Web · Smart TV — synced in real time 2,000+ on-demand classes 175+ markets worldwide 4.9 / 5 average rating LIVE 142 BPM RANK #3
14 · Real Product Screenshots

What the actual product looks like

Genuine images pulled directly from FIIT's official Google Play listing and fiit.tv — not mockups. The logged-in web/mobile dashboard sits behind a member login and isn't publicly crawlable, so the mobile shots below are FIIT's own submitted Play Store screenshots, and the web visuals are real photography and UI assets served from fiit.tv's public marketing site.

Fiit Android app screenshot 1
Fiit Android app screenshot 2
Fiit Android app screenshot 3
Fiit Android app screenshot 4
Fiit Android app screenshot 5
Fiit Android app screenshot 6
Fiit Android app screenshot 7
Fiit Android app screenshot 8
Website — Real Assets from fiit.tv
Fiit Strength studio class thumbnail
Strength studio — class library thumbnail, fiit.tv
Fiit HIIT class thumbnail
HIIT studio — class library thumbnail, fiit.tv
Fiit Yoga class thumbnail
Yoga / Rebalance studio — class library thumbnail, fiit.tv
Fiit Bike class thumbnail
Bike studio — connected hardware class, fiit.tv
Fiit trainer Adrienne headshot
Trainer roster — Adrienne, fiit.tv "Meet the Trainers"
Fiit trainer Pete headshot
Trainer roster — Pete, fiit.tv "Meet the Trainers"
16 · Conclusion

A platform built around the habit, not just the workout

Summary

FIIT's strength is treating "where you train" as a non-decision: the same account, plan and leaderboard travel from phone to browser to Smart TV. Its free, no-card scheduled-class tier lowers the barrier to a first workout, while live Group Workouts and gamified tracking do the work of keeping people coming back.

Product impact & future scalability

With 20M+ workouts logged across 175+ markets and a 4.9/5 rating from 45K+ reviews, the model has proven durable. The architecture pattern above — isolating live telemetry from catalogue and billing — is what would let a platform like this keep adding device targets (new Smart TV SDKs, in-gym kiosks) without live-class performance degrading as the member base grows.

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