I pulled my right hamstring a few weeks ago, and this is the only explanation for that. The quads and the hamstrings are opposite and connected muscles. When the quads are stronger, they pull the hamstrings when I overstreched with lunges while playing. I always stretch thoroughly before and after playing, so there should not be problems related to stretching. I do squats and lunges regularly, but neglected the hamstrings. I can still play, but it hurts a little bit when I lunge with an angle of more than 90 degrees. I'm doing strength exercises for the hamstrings using ankle weights (e.g., hamstring curls). I wonder if anyone has got this problem. If so, how long did it take your hamstrings to completely recover? Right now it's really frustrating to see the shuttle drop and know if I lunge further I can get it, but I should not do that so that my hamstrings can recover.