Which muscles are involved in the straddle stretch? I feel a little sharp pain when sitting in straddle position with legs about 90 degrees apart. That's the maximum I can go currently. I used to be able to open up till about 160 degrees before something unknown happened, causing a sharp pain to be felt at my inner thighs everytime I do this stretch. I've consulted 3 physiotherapists and no one seems to know what's wrong, so I just assume I'm not injured anywhere. Anyway when I try to reach forward, it becomes much more painful. So I'm wondering which of my muscles(s) is tight? I can do the butterfly stretch and the piked stretch alright. I experience pain mostly when I have to stretch my 2 legs apart, like for arabesque, grand battement. But it's the most painful for straddle stretch.