WARM UP TO REV UP YOUR WORKOUT PERFORMANCE For years I went through an involved stretching routine before I set off on a run or took a group fitness class. But then I began reading that static stretching might be anti-productive and can actually weaken performance—most likely because holding stretches tires out your muscles. So, lately I’ve just done 20 toe touches plus a short walk. Yet, now I’m hearing that we should actually be doing a dynamic warm up before jumping into a run or a fitness class. This helps prepare the body for either aerobic or strength activities...