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About the application:

The plank (also called a front keep, hover, or abdominal bridge) is an isometric core strength exercise that involves maintaining a position related to a push-up for the maximum possible time. The plank strengthens the abdominals, back, and shoulders. Muscles involved in the front plank include: Primary muscles: erector spinae, rectus abdominis (abs), and transverse abdominis. Secondary muscles: trapezius, rhomboids, rotator cuff, the anterior, medial, and posterior deltoid muscles, pectorals, serratus anterior, gluteus maximus, quadriceps, and gastrocnemius. Muscles involved in the side plank include: Primary: transversus abdominis muscle, gluteus medius and gluteus minimus muscles, the adductor muscles of the hip, and the external, and internal obliques. Secondary: gluteus maximus, quadriceps, and hamstrings.