The Psoas muscle is usually tight and tender in most people. Jiu-Jitsu practitioners are no exception since we focus on keeping our hips up and in to prevent guard passing. Releasing this painful, tight, and tender muscle can be a challenge, but this technique is relaxing and easy to do. Not to mention that tight psoas muscles can be a contributor to low back pain, which is another common issue with BJJ players. Try this technique out, you will have looser hips and less pain.
Link to ball: https://www.amazon.com/Sportime-Super-Safe-Softballs-Inches-Yellow/dp/B0042SR0TU/ref=sr_1_5?ie=UTF8&qid=1522162804&sr=8-5&keywords=all+ball
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