Isometric exercises build up muscle mass and aerobic exercises build up our heart and lungs.
By increasing our heart rate through aerobic exercise, we increase the strength of our heart muscle which makes our heart more productive and more functional. By engaging in isometric exercises, which build up muscle mass, we increase our strength and reduce our chance of injury. A variety of isometric exercise routines are described in the Exercises section below. There are a variety of formulas to help determine your heart rate target zone. A general and simple formula is to subtract your age from 180.