I feel stupid even asking this question, I hope no one laughs! I just got a heart rate monitor and used it for the first time to a video I consider to be intermediate for me. I felt fine working out, I don't think I was even "pushing" myself and my heart rate was around 85%. I don't know if maybe the monitor is wrong or if I'm working out harder then I need to be. My question is what happens when you exercise above your THR? I always hear you shouldn't, but I don't know why. Does anyone know? Should I lower my intensity? Thanks!