I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Stand with your torso on the support with your knees on the pads and your leg extended. Your ankle is placed under the pads :
Inhale and flex your knee
Exhale at the end of the movement
This exercise works all hamstrings muscle (semi-tendinous, semi-membranous, biceps femoris short and long head) and a little bit gastrocnemius. To work more intensly your gastrocemius, during the flexion of your knee, you need to have your ankle in flexion. If you don’t want work more intensly your gastrocemius, keep your ankle in extension during the movement.
By contracting simultaneously, hamstrings and the 2 gastrocnemius muscles of the triceps surae flex the knee joint.
Biceps femoris short head
For all flexor muscles, the biceps femoris short head is the only one to be monoarticular.
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