What is the primary technique used in isometric exercise?

The primary technique used in isometric exercise involves generating maximum force for a short duration without any change in muscle length or joint angle. This method emphasizes the static contraction of muscles, where individuals hold a particular position against resistance, leading to increased strength in the specific muscle group targeted during the exercise.

Isometric exercises can be highly effective for building strength, particularly in rehabilitation settings, as they allow for muscle engagement without the stress of joint movement. This is particularly beneficial for athletes looking to improve strength without the risk of aggravating an existing injury or condition.

In contrast, the other options refer to different types of exercise techniques. Continuous movement relates to dynamic exercises and focuses on motion rather than stabilization. Dynamic stretching involves movements that increase muscle flexibility and range of motion, rather than static muscle contraction. Performing with variable resistance typically applies to dynamic exercises that adjust load as movement occurs, which is not aligned with the principles of isometric training. The key aspect that differentiates isometric exercise is the focus on sustained muscle contraction without movement, making the generation of maximum force for a short duration the defining characteristic.