Are you squating and working your ass off literally to round up those glutes but they seem to sagg and on top of that your hamstrings are tense all the time with no apparent reason?
Or are you an athlete with tense hamstrings ?
You may be suffering from posterior pelvic tilting this is caused by weak hip flexors for hip stabilizing and too much tension in the hamstrings and glutes or muscle imbalance between hamstrings, glutes, rectus abdominis and quads ,the later being weaker.
Posterior pelvic tilt is a condition characterized by the pelvis being pulled downward in back, causing the lumbar arch to decrease. This condition can cause back, hip and leg pain.
Here is an image to see what i’m talking about:
In order to get the pelvis in neutral tilt you should concentrate on increasing the mobility of the hamstrings and less on the mobility of the hip flexors for the time being.
These 3 muscles pull on the pelvis and tilt it backwards if not stretched.
-Train your abs and your quads in order to stabilize you pelvis
In order to do that here are some stretching and Yoga poses that increase the hamstring mobility:
-while doing the stretch concentrate on flexing the trunk on the leg
-stretch while exhaling
-keep that stretch for 30-60s then relax 20s and stretch again
-do this exercise 3 times a day or as many times as you feel tense
-don’t stretch untill it hurts ,the muscle is contracting and not relaxing if it hurts