Hi Blenders!

I'm wondering if you have any ideas for me. I've been experiencing lower back pain at rest after finishing lower body strength routines. I don't have any pain at all while working out (or while warm in general), and the pain only seems to set in when my muscles are cold and I'm seated. I suspect this has to do with very tight glutes and hamstrings, but I've been stretching a lot throughout the day without a lot of improvement. Has anyone else experienced this, and how did you avoid this discomfort?

Thanks in advance! :)