MUSCLE PHYSIOLOGY

Detailed explanation-1: -A wall sit is an isometric exercise involving muscle contraction while in a static position.

Detailed explanation-2: -Stationary exercises such as wall sits, planks, bridges, hollow-body holds, are isometric. While a yoga class involves isotonic elements as you move through the poses, each held pose is, in itself, an isometric exercise.

Detailed explanation-3: -Isometric contraction occurs when muscle length remains relatively constant as tension is produced. For example, during a biceps curl, holding the dumbbell in a constant/static position rather than actively raising or lowering it is an example of isometric contraction.