L5-S1 consists of the last bone in the lumbar spine (low back), called L5, and the triangle-shaped bone under it, known as the sacrum. The sacrum is made of five fused bones—S1 is at the top.

When you have back pain, perhaps the last thing you want to do is get out of bed. But you actually want to get moving to achieve relief. Move through these exercises from fitness expert Dana ...

It's not uncommon for older adults to experience the pain and hunched posture of lumbar degenerative kyphosis. Keep reading to learn about treatment options and more.