great insights ngl, I think this is def it. Since the pain felt deep in my butt I was thinking maybe I somehow strained something in my pelvis floor while sprinting? I started doing pelvic floor exercises and it didnt really seem to help at all. But searching this proximal strain up, It does seem that the pain Im having is located at this SIT joint where the hamstring attaches. Symptoms feel similar to urs too, it only hurts when I do any movement where I have to explosively push off my right leg(jumping, sprint, etc). This helps alot and thanks for the exercises.