main agonists
M. obliquus externus abdominis
M. transversus abdominis
M. rectus abdominis
synergists
M. gluteus medialis
Description:
For this test you need the straps. With your legs apart so that your feet are under your hips lean slightly forward with your back straight. Your head is in line with your spine. Your arm is stretched out and the strap is tight. Out of this position pull with maximal force for about 5 seconds.