Train by the numbers
Four free tools that answer the questions every exerciser actually has: am I doing enough, how hard should this feel, what weight goes on the bar, and how do I start running. Everything runs in your browser; nothing is sent or stored.
WHO Activity Gap Check
Log a typical week and see exactly how it compares with the WHO guideline, and exactly what would close the gap.
2 minutes
Heart-Rate Zone Builder
Your five personal training zones, from age alone or the Karvonen method with your resting heart rate.
1 minute
One-Rep Max Calculator
Turn any hard set into an estimated 1RM and a loading table, using the Epley and Brzycki formulas.
1 minute
Walk-to-Run Plan
A printable 4-week run/walk plan matched to your starting point, with a proper safety check first.
2 minutes
From the Healthspan ecosystem
StayFit.mu is part of the Healthspan family. For the bigger picture, the free Foundations Snapshot looks at movement alongside sleep, nutrition and stress, and the Healthspan shop carries the basics worth tracking with: smart scales and blood pressure monitors.