Pins and needles. Dull pain running the length of your hamstring. A sharp ache in your ass when you sit down. Clients come to me on the reg with complaints about pain in the ass. No, they’re not referring to me. While it’s common to think it’s Sciatica, which is no fucking joke, I’ve found it’s more often a case of yoga butt. Hamstring pain is a killer.   Yoga Schmoga. I haven’t been doing yoga.   But Julia, I don’t even DO yoga. Even if you don’t do yoga, you can overuse or strain the fascia and upper tissue of the hamstrings. The number one thing people do when…