When I do a standing pike, I need to bend my knees slightly in order to focus the stretch on my hamstrings. If I do a pike stretch with locked knees, the backs of my knees feel some small pain. I also can't stretch far enough forward to feel a stretch in my hamstrings.
So the emphasis has moved from my hamstrings (which I'm trying to stretch) to my knees (which sounds bad to me)
Anyway, I've heard that you're supposed to pike with locked knees, so has anyone got any advice here? Is there something I'm missing?