Web application
ZyFit: a gym tracker, workout planner and fitness calculator set
Log every set. Plan every week. See real progress. ZyFit records each set with weight, reps and RPE, times rest automatically, detects personal records, and adds an AI Coach that answers questions from your own training log.
- Type
- Web application
- Built with
- Next.js
- Calculators
- 13
- Exercise library
- 72 exercises
What it does
Log every set in seconds
Record weight, reps and RPE as you train, with your last performance for that set shown alongside.
Plan the week
Build routines and programs across the week, with target reps, RPE and rest for each exercise.
See progress from real data
Estimated one rep max trends, weekly volume and muscle distribution, all computed from completed sets.
Personal records
Personal records and achievements are worked out from your own log only.
AI Coach
Ask it to review a session, plan the next one, or draft a full training week. It answers from your own training log.
Rest timer
The rest timer counts down in the tab title and keeps running in the background. Warmup, working and drop sets are recorded separately.
Nutrition and hydration
Log food and water against targets set by the calculators.
Exercise library
A library of 72 exercises to build routines from.
Calculators
ZyFit includes 13 documented calculators:
- One rep max, using the Epley and Brzycki formulas.
- Barbell plate loading.
- Warmup ramp.
- BMR and TDEE, using Mifflin-St Jeor and Katch-McArdle.
- BMI, checked against a healthy weight band.
- Body fat, estimated by the US Navy method.
- Ideal weight, using the Devine, Robinson and Miller formulas.
- Heart rate zones.
- Calories burned, MET based.
- Macros, split into daily gram targets.
- Protein, as a target of its own.
- Water intake.
- DOTS score.
How to start
- Open the app. Go to zyfit.zynu.me in a browser. Nothing to install.
- Log your first session. Add exercises, record weight, reps and RPE for each set, and let the rest timer handle the breaks.
- Plan next week. Turn your sessions into routines and programs, then ask the AI Coach for a review or a draft of the next week.
Sample data. The numbers on the phone in the preview are sample data. Yours start empty and build from your first session.
Not medical advice. ZyFit provides training tools and educational content for general fitness purposes. It does not provide medical advice.
Start logging
ZyFit is live. Its own privacy policy and terms of service apply once you open it.