The chair
2 or 3 times a week
9mins.

30 secs hold
+
1.5 mins rest
x
5
The aim of the exercise is to maintain a position for a given period of time. Your muscles contract even more that way.
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Rest your back against a wall, with your legs bent at a 90° angle, as if you were seated on a chair. Place your hands on your thighs to make it easier or cross your arms for more intensity.
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During the exercise, ensure that your buttocks and the top of your back are in contact with the wall..
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While you are resting, do not remain immobile and walk around a little.