Hamstrings (the muscles in the back of the leg) are very important muscles, yet they are often neglected. Most people's quads are much stronger which leads to muscle imbalances. Developing strong hamstrings will help prevent injuries and help maintain good posture. Because weak hamstrings limit both range of motion and explosive power it is extremely important to work the hamstrings if you play sports or if you're a runner. Building the hamstring muscles will also help with cellulite in the back of of the legs, which is a problem area for many women.