I've been getting a nagging feeling in my left hamstring recently. It wasn't very bothersome for about a week, but now it's tight. If I massage it, I can feel a little bit of pain. I know it's not really serious. My question is what should I do? Skip a leg workout and just do upperbody or do some different leg exercises or just stretch? Not sure. I did do some googling, but nothing really seemed definitive. Thanks in advance.