Your hamstrings actually consist of three main muscles: the semimembranosus, the semitendinosus, and the biceps femoris. The biceps femoris includes two separate heads, a long head and a short head.

There are at least two distinctly different types of acute hamstring strains, one occurring during high-speed running and mainly involving the biceps femoris long head, the other during movements ...

qut.edu.au Objective To determine which strength training exercises selectively activate the biceps femoris long head (BF LongHead) muscle. Methods We recruited 24 recreationally active men for this ...