There are many kinds of gym rats: stationary bikers, treadmillers, iron pumpers, and the folks who started core exercises but are now lying on the floor listening to music. While everyone has a preferred exercise, a balance of cardio and strength training, according to physician Peter Attia, may have a positive influence on longevity — and something called healthspan. Whereas lifespan refers to the number of years someone lives, healthspan refers to how many healthy years that person gets.
