Nepmind Labs
Low-impact fitness & trainingFitness & WellnessCompletedFitnessWellnessMobile

LIT

Low-impact HIIT with personalized plans, guided workouts, and progress tracking—built for results without injury.

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Project snapshot
Client
LIT
Type
Startup
Region
North America
Engagement
MVP Build
Duration
6 months
Started
Q4 2025
MobileBackendAPIData
Objective

Ship a mobile-first training companion that keeps intensity high while respecting joints, recovery, and real-life schedules — so members stay consistent without burning out.

Audience
Professionals who want efficient sessions without a gym commuteRunners and lifters returning from nagging injuriesBeginners who find traditional HIIT intimidating or harsh on the bodyTravelers needing hotel-room and minimal-equipment options
Platform
MobileBackendAPIData
Problem

Most fitness apps push one-size-fits-all HIIT scripts: too much impact, too little context for sore knees or tight shoulders, and progress charts that reward ego over sustainability. People quit — or worse, get reinjured.

Solution

We paired adaptive programming with guided sessions and honest progress signals. The app meets you where you are, scales load and impact intelligently, and celebrates streaks that align with recovery — not just calories torched.

Showcase

A closer look at LIT

Selected screens across the product — from marketing surfaces to in-app flows.

Mobile
Native iOS & Android flows
Welcome & value proposition
Today’s plan at a glance
Programs & tracks
Guided session player
Progress & trends
Profile & preferences
Features

What we built

The core capabilities shipped as part of the engagement.

Personalized low-impact plans by goal, schedule, and available equipment
Coach-led workout player with timers, audio cues, and form prompts
Volume, readiness, and trend insights that highlight sustainable wins
Swap library for joint-friendly alternatives when something feels off
Offline mode for flights, spotty gym Wi‑Fi, and morning garage sessions
Optional health-kit sync for heart rate zones and active energy
Architecture

How it's built

The stack and architectural layers powering the product.

Core stack
FlutterNode.jsPostgreSQLAWS

Backend

Node.jsExpress

Mobile

Flutter

Data

PostgreSQLRedis

Infrastructure

AWS ECSS3CloudWatchGitHub Actions

Integrations

Apple HealthGoogle FitOneSignal
Compliance & security
Data minimization for health metricsEncryption at rest and in transitRegion-aware retention defaults
Delivery

Timeline & team

How the engagement was structured across 24 weeks of work.

Phase 1
3w
Discovery
Phase 2
16w
Build
Phase 3
5w
QA
Team on this engagement
Product ManagerUI/UX DesignerFlutter EngineerBackend EngineerQA Engineer
Impact

Results that mattered

Measurable outcomes tracked against the KPIs that drove the build.

4-week retention
41% lift vs. baseline cohort
Session completion
89% of started workouts finished
Support tickets — injury concern
Down 63% after v1.2 modifiers
Outcomes

What changed for the business

Launched App Store and Play Store builds with shared Flutter codebase
Instrumented funnel and workout analytics for iterative programming
Established content pipeline for coaches to publish new plans without redeploys
“Nepmind translated a fuzzy 'we want HIIT without the hospital bills' brief into a product our members actually finish. The polish shows.”
Jordan Ellis
Founder, LIT

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