the biceps femoris muscle

listen to the pronunciation of the biceps femoris muscle
الإنجليزية - التركية
الإنجليزية - الإنجليزية
hamstring

Developing muscle around both sides of a joint (think biceps and triceps, abs and low back, quads and hamstrings) should be one of your primary training considerations because strength on each side leads to lower injury rates.