Originally Posted by
arok
that - try stretching your hamstrings, it helps me a LOT after hard rides.
I have relatively poor core strength and hard rides kill my lower back. Stretching helps a lot, but more consistent hard rides with proper rest in between will help strengthen your core too
Bingo. For me, I get back pain when I have tight hamstrings. Especially if it is single-sided (as in left side only), hamstrings could be the culprit.