Paul Zaichik of Elastic Steel explains how to do a half side split. The half side split is a very basic technique. First, kneel on the floor and lean forward. Then extend one leg so that it is perpendicular with your torso and so that both your body and foot are at 45 degree angles. The other leg will remain bent. You can also lean forward so that both your body and foot are leaning against the floor. Bend the leg to match the other leg and rest in that position before extending the other leg to the half side split position.