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.
Dear Dr. Donohue: Some time ago, I remember reading what you wrote about isometric exercises. It intrigued me at the time. I forgot the details. Will you have another go at it? -- K.R. Dear K.R.: ...
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