maratoolFitness calculators
Exercise reference and training math: movements by muscle, pace, speed, and race projections.
Exercise Database — Browse Exercises by Muscle & Equipment
Browse 1,035 exercises by muscle, equipment, and difficulty. Step-by-step instructions and a muscle map for every exercise — free, no sign-up.
Running Pace Calculator — Min/km, Min/mile & Race Times
Calculate running pace per km and per mile from distance and time, plus projected 5K, 10K, half and marathon finish times. Free, in your browser.