The Harvard Step Test is a simple way to check how fit your heart actually is. You step up and down at a steady pace, then your heart rate is measured during recovery. The faster your heart rate returns to normal, the higher your Fitness Index — and the fitter your cardiovascular system. It’s not about how you look, it’s about how efficiently your heart works under stress and how quickly it recovers after. That’s why regular exercise and gym sessions matter — you’re training your heart to work b