Two minutes here saves your back from a bad day.
Relax your shoulders and jaw. Tension up top blocks the release down low.
Pulling your knees toward your chest gently rounds the lumbar spine and lets the muscles along it lengthen, a position most lifters never visit between all the bracing and arching. The lower back releases best when you stay heavy on the floor and breathe slowly, which is why this is a timed hold rather than reps. It slots in after deadlifts, squats, or a long day of sitting, anywhere your lower back is holding tension it does not need.
Thirty seconds to two minutes works for most people. The magic is in slow breathing, every exhale lets the back sink a little further into the floor. Coming out early because you never settled in is the most common mistake.
Both knees gives a stronger overall release, one knee at a time is gentler and lets you compare sides. If pulling both in feels like too much, start single and progress to double.
After training, before bed, or any time your lower back feels locked up. Save it for after lifting rather than right before heavy sets, you want your spine braced and springy under load, not maximally relaxed.
