To build strength using isometric exercises, it is best to hold the contraction maximally for at least 30 seconds.

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Quizplus · Accepted Answer

Isometric exercises typically involve holding a contraction for a shorter duration, around 20-30 seconds, but maximal strength gains can often be achieved with even shorter holds, such as 5-10 seconds, depending on the exercise and the individual's fitness level. Longer holds are not necessarily better for building strength and can increase the risk of injury.

To Build Strength Using Isometric Exercises, It Is Best to Hold