Your hamstrings (the back of your thighs) are hard to target by themselves. This move is not only fun to do (I hope you all yell Geronimo! like I do) but it will tighten your entire thigh! 1. Begin on your hands and knees with your feet tightly secured to the wall behind you. 2. Keeping your feet against the wall and staying on your knees, erect yourself to an unpright position from your knees to your head (no flexion at the hip). 3. Engaging your hamstrings and keeping your arms in front of you to catch you, slowly lower yourself to the floor, being careful not to bend at the hips. 4. Using your arms and being careful not to bend at the hips, engage your hamstrings to bring your torso back into a upright postion.