![](http://3.bp.blogspot.com/_P3eMCvEKCUU/Sx5GhBgO28I/AAAAAAAAAHI/B633pGFTRj0/s400/bicepcurl-main_Full.jpg)
In this picture we can see that when we do bicep rod we cant move our elbow it needs to be in constant position. The biceps is actually a smaller muscle then the triceps. It is on the front of the upper arms. There are two heads of the biceps muscle (hence the bi in biceps).