Which activity requires isometric strength?

A) yoga
B) running
C) cycling
D) swimming

Isometric strength is the ability to hold a static position or resist against a force without movement. As many yoga poses (such as plank, chair pose, and warrior) involve holding a posture without movement, yoga is the best choice for requiring isometric strength. Running, cycling, and swimming require more dynamic, repetitive movements, and therefore use more isotonic strength.