always remember to stretch the opposing muscle(s) as well.

after I'm warmed up /after a ride, I get on the yoga ball and lay on my back, opening up my front / chest / stomach / front of the legs. sorry, don't know all the muscle names.

but I'm usually pretty tight in the very top of my quads where they meet the hip, so this is a good stretch for that. you can just relax and breathe, vs that standing pose above where you have to maintain some degree of muscle tension and posture.