I never ever stretched for bicycling although I did stretch my core before hockey games. Only did it in hockey because coaches make you, the skating action is rather violent to the core and tendons thererin

I am starting a stretching thing for left side proximal hamstring tendinopathy, a real pain in the butt. I got a fit. A new bike. 4 different saddles. My problem started after an accident and lots of broken bones. At this point, figure nothing to lose. I use a roller and/or ball of the left hamstring just below where it attaches to the ischial tuberosity. If that does not work, I might buy 160 mm cranks.