STRNTH: Strength Training Log

STRNTH is a strength training app and workout log for lifters in their 30s, 40s and beyond. Plan your gym sessions, log every set and track progressive overload.

Open STRNTH and the session is ready. Exercises, sets, reps and weights laid out before you start. Log a set in two taps. Each workout builds on the last. Weight progression, deload weeks and recovery handled for you.

Most fitness apps were built for people in their 20s. STRNTH works with how training actually goes after 40. Recovery takes longer, intensity needs to build, and progress should be measurable.

What you get

Strength training programmes
- Multi-week strength programmes with planned phases and built-in weight progression
- 4, 8 or 12 week durations to match real life
- Age-aware training that scales recovery and intensity
- Deload weeks built into every programme

Gym workout tracker
- Over 200 exercises with descriptions, alternatives and muscle group mapping
- Quick workouts from 15 to 120 minutes
- Smart exercise swaps mid-workout
- Warm-up sets that build to your target weight
- Two-tap set logging with auto-fill from your last session
- Rest timer that keeps running with the screen locked
- Describe a workout in plain words and STRNTH logs it for you

Cardio
- Log runs, rides, walks, swims and cardio machines as part of any workout
- Capture distance, duration and pace, with incline and resistance for machines

Build with AI
- Build a strength workout or HIIT session from a short description
- Connect an AI assistant like Claude, ChatGPT or Gemini to plan and build straight into the app (beta)

Bring your history
- Import your workout history from Hevy or Strong as logged sessions and routines
- Import your body measurements from Hevy

Progress tracking and analytics
- STRNTH Index, a single score for overall strength
- Five strength tiers from Foundation to Elite
- Plateau detection that flags stalled lifts
- Personal records logged automatically
- Trend charts over weeks and months
- Weekly summary every Sunday with top lift and total volume
- Full history searchable by exercise

Body tracking
- Weight tracking with trend lines
- Body fat tracking with a guided caliper method
- Progress photos with before and after comparison, lockable behind Face ID
- Goal setting and daily calorie targets based on your activity

HIIT and conditioning
- Six modalities: cycling, treadmill, rowing, boxing, floor work, mixed
- Five heart rate zones and seven power zones
- Bluetooth heart rate monitor and smart trainer support
- Adaptive resistance to keep you in your target zone

The Locker Room
- Browse strength programmes and HIIT sessions shared by other STRNTH members
- Clone any session into your library in one tap
- Filter by split, days per week, duration or modality

AI strength coach
- Weekly summary with personalised coaching focus
- Plateau and overload risk flags before you feel them
- Block reviews at the end of every programme
- Ask STRNTH, answers built from your own training data

The basics
- Works offline so you can train anywhere
- Syncs across phones and tablets
- Email code sign-in, no password to remember

Pricing

STRNTH has three tiers. Free to download, no card required.

Free
- All curated strength programmes and HIIT presets
- Full workout log, progress charts and body tracking
- 200+ exercises and warm-up logic

Plus
- Custom programme builder for your own multi-week plans
- Custom workout builder and saved sessions
- Custom HIIT builder with five block types
- Browse and clone Locker Room content

Pro
- Everything in Plus
- AI weekly summary and coaching focus
- Ask STRNTH for AI Q&A from your own training data
- AI workout generation, describe-to-log and build with AI
- Plateau and overload risk flags
- Block reviews after every programme
- Cloud backup across devices
- Publish to and enrol from the Locker Room

See in-app for current pricing.