Curls for the biceps. Bicep Femoris that is. What's the first thing that comes to mind when you want to grow your biceps? Curls right?! We'll just like the highly sought after flex till you're famous muscle, the legs have biceps too. Called the Bicep Femoris (long head & short head) in the "hamstring" So if you want those to grow & show just like your arms, try to incorporate Curls to build strength, stability and symmetry in the legs!