Hip to Be Square
Whichever poses you are working on to lengthen your adductors, give the stretching plenty of time. I like to spend a minimum of one to two minutes in any asana of this sort. As you work patiently, it helps to visualize your adductors, inviting them to let go with each exhalation. Remember, these are big and potentially strong muscles, and they need plenty of time to relax deeply. They will also probably need months of regular stretching to change their length. But eventually, a well-rounded yoga practice that includes both strengthening and stretching your adductors will mold healthy muscles that are both powerful enough to do their job and flexible enough to allow you to move freely.