Hyper Male Force To achieve maximum contraction of the abs muscles, raise your legs as high as possible, since in the lower part of the amplitude, most of the work rests on the thigh muscles. To engage the maximum amount of muscle fibers of the press, lift the pelvis when the legs cross the horizontal level and go higher. Do not take your legs too far back, this will cause the body to swing and throw its legs up inertia, which will significantly reduce the effectiveness of the exercise. If the grip strength of your hands is not large enough to hold the body throughout the approach, use gymnastic or athletic straps. Holding the breath during the exercise allows you to stabilize the position of the spine and developing a powerful effort to raise your legs higher. Start learning the exercise with knee lifts.