Tighten the thighs . Especially the top and the inside of the thighs are easy to tighten in a sitting position. Although the back of the upper legs will also participate during the tightening. This exercise can also be performed simultaneously with exercise 2. Tighten the thighs, hold for at least 5 seconds and release. Then tighten the legs again within a few seconds, hold for at least 5 seconds and let go again. In order not to always have to count, which can be experienced as a distraction from work, you can also tighten and hold your legs longer.