I have a herniated disc in my lower back which is the main reason a lot of the surrounding muscles are locked up after a workout. My hip flexors and psoas in particular are always tight, causing pain when bending over and standing up. These balls are so simple and yet so effective. I lie on my stomach on a thick yoga mat, balls under my stomach, a few inches on either side of my navel. I stay in this position for a few minutes, then gradually move the ball to another spot and do the same. At some point all tensions will be released. I also lay on my back with them under each side of my spine. They do an excellent job with kinks in the shoulder blades and neck. I don't know why I didn't buy them sooner. Whenever I'm in pain, I know using these balls will solve my problem. Highly recommended.
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