Isometric exercise employs the static contraction of muscles without changing the length of the muscle or moving the joint. This simultaneous contraction of muscle and focus on breathing is more effective at delivering higher amounts of oxygen to the body than normal exercise, in which breathing is shortened. Isometrics are an excellent way for people who have limited movement to exercise. People who cannot stand, move or lift can utilize isometric exercises to get into better shape. This type of exercise can be utilized for general strength conditioning, rehabilitation, and weight loss.

Many physical trainers believe that incorporating isometric exercise can improve the overall strength of their clients. Isometrics are often performed by using immovable objects or resistance. Many forms of exercise, such as yoga or martial arts, incorporate isometrics by using static poses. Isometrics increase strength at the joint angle of muscles where traditional exercise increases strength by using full range of motion and enhancing twitch forces within the muscle fibers. For most athletes, both styles of exercise must be incorporated into the training regimen for maximum effectiveness.

Isometric exercises are performed in sets similar to traditional dynamic exercises. These sets are counted by seconds, with longer durations having fewer repetitions and shorter durations having more reps. Both approaches will ultimately lead to greater strength. Full body isometric exercises are beneficial for several muscle groups and also integrate the core abdominal muscles. Examples of these full body isometrics include plank bridge and side bridge, where the participant holds the body upright in a modified push up position.