While I ackowledge that the knee flexion movements pose less of an issue for very short acceleration work; I still favor hip extension moves.
Thus for clarification sake, I , personally, only use the flexion movements for select rehabilitative and restorative situations.
While the hamstrings are less active during early acceleration- their role as a hip extensor remains the dominant one. It then stands to reason they should be trained accordingly
So in my block A for my American footballers, I select to train the hamstrings appropriately as a hip extensor yet more aggressively via RDLs. The greater loading via the RDLs is well tolerated due to the lesser hamstring demand of the hill sprints.
Then, as we progress to flat ground and longer and/or faster sprints, which place more stress on the hamstrings, I back off on the weight training load and eliminate the RDLs in favor of back extensions.
This transition is smooth because its purely subtracctive. Meaning, we always perform back extensions as an auxiliary move; so its simply a matter of eliminating the RDLs and continuing with the back extensions.
Thanks for the kind words.
Ha I knew I was following someone that is considered 1 of the best! Whenever I did the leg curls they hurt the back of my knee also ( I had a torn acl). But when I do the others they dont hurt at all.