2
votes
2answers
178 views

Core training and muscle cramp?

I have started regular strength and core training for the part few weeks after years of no exercise. For the last 2-3 days I notice that I wake up in the night with a back ache that involves muscles ...
4
votes
1answer
2k views

Can psoas muscle cause lower back pain?

Can tight psoas muscle cause lower (lumbar) back pain? If yes, which exercise would be best to recover? Thanks. How do you differentiate if the pain in lower back is because of tight psoas or due to ...