Isometric, isotonic, and isokinetic exercises refer to the different techniques for activating and strengthening muscles. Isometric exercises, like planks, involve activating muscles with no movement.

Isometric exercises might sound like something straight out of a fitness science lab, but they're actually one of the simplest and most effective ways to build muscle and strength. Imagine holding ...

Because they are low-impact, isometric exercises help injury recovery and relieve joint pain. Isometrics don't require equipment so you can do them just about anywhere, even on a plane.