Health
WHR calculator
WHR is the ratio of waist to hip circumference. It tells you where fat is stored, and visceral belly fat is the metabolically dangerous kind; that is why WHR is often a better warning light than weight alone.
Why waist, not weight
Visceral fat, wrapped around the organs in your abdomen, is hormonally active and strongly linked to insulin resistance, hypertension and heart disease. Two people at the same weight can carry wildly different risk; WHR catches that.
In the app: Tabata Timer by fit.how has these calculators built in, plus an interval timer you can read from across the gym. See the app.