The wall sit exercise
The wall sit exercise is sometimes considered a leg and hip exercise, and other times considered a core exercise. In this particular pose, one sits with their back to vertical against the wall, their thighs parallel to the floor, and calves parallel with the wall. It is important to remember that when doing this exercise, it is important to keep the abdominal muscles tight. It is also important to tighten the buttocks for the duration of this exercise. As for length of amount of time to do this exercise, my recommendation, and what I learned, is to start out for about 30 seconds with this particular exercise. The next day that can be increased by another 15 seconds. In future days the time can be increased until this exercise is too much. The way I know what is exercise is finished, is that there is a steady burn developing in the thigh muscles.

The Wall Sit Exercise with Sarah