Recently came across this video on the science behind stretching:
It's quite long (45 minutes) and doesn't provide a lot of black-and-white answers, but it does have some great points to consider and is well presented, hence being a Best Lecturer finalist in 2009.
My take-aways from the lecture are:
- for cycling performance, stretch muscles that help to get into a good position on the bike (e.g. hamstrings, lumbar spine)
- for everyday health, I expect I would need to stretch my hip flexors...but until I stop racing, I'll skip that and just concentrate on holding good posture when I need to stand :)