Originally Posted by
terrymorse
On the other hand, there appears to a misconception that hamstrings don't contribute much to crank torque. That's not the case. They are doing considerable work:
Source: da Silva JC, Tarassova O, Ekblom MM, Andersson E, Rönquist G, Arndt A. Quadriceps and hamstring muscle activity during cycling as measured with intramuscular electromyography. Eur J Appl Physiol. 2016 Sep
The hamstrings obviously have to function, but what is their actual percentage contribution to crank torque? Single leg drills really show up their relative weakness.