Cyclists' low back pain usually isn't coming from the back

A riding position holds the hip in deep flexion for hours. The muscles at the front of the hip sit short the entire time. The adductors on the inside of the thigh work continuously to stabilize the leg through the stroke, and they also sit short.

Muscle held short and working hard for long periods adapts to that length. It gets strong in a narrow range and stiff outside it.

Then you stand up off the bike, and the pelvis is asked to return to neutral by tissue that has spent four hours deciding it lives somewhere else. The pelvis tilts forward. The lumbar spine takes up the extra range, because something has to. Your back isn't the problem. Your back is the part that moved because the hip wouldn't.

Not passive stretching alone. Range you can't control is range your nervous system won't let you use under load — it will simply guard it back.

What works is range plus load. Get into the position, then work actively in it: shift the hips side to side while holding the overhead reach, hold the end position and gently push into it. Then load the hip through that new range with strength work — split-stance hinges, single-leg work, the same pattern that fills in the dead spot in your pedal stroke — so the range becomes something your body trusts at 40rpm on a climb.

Three sets, twenty seconds a side, then load it. Daily through a heavy riding block. The glute work belongs here too — a hip that can't extend and a glute that isn't contributing are usually the same story told twice.