There are exercises which requires a lot of training before doing such activities because without proper training, it could give your body a shock that could be dangerous to your health. When I enrolled at a gym, my instructor told us that before we could lift weights, we should tone and ready our muscles and mind first. Too much exercise could lead a person to fatigue because of doing such tremendous activity that his body wasn't prepared of. Also, avoid doing too many exercises, limit yourself unto the point in which your body can. Slowly, you can add up more time and more exercise to your routine, you just have to let your body adjust.