A quick question...
When I raise my knee to my chest, then bring my legs straight again, there is a loud "klunk" in my lower back/pelvis region. WTF is it? My back hurts like hell on both sides. It is very bad if I am doing double leg raises for low abs. Each time I lower my legs to the ground my back will "klunk" Help!!!!!Thanks

When I raise my knee to my chest, then bring my legs straight again, there is a loud "klunk" in my lower back/pelvis region. WTF is it? My back hurts like hell on both sides. It is very bad if I am doing double leg raises for low abs. Each time I lower my legs to the ground my back will "klunk" Help!!!!!Thanks

