More energy for weight lifting

While you are doing any kind of exercise, whether it is warm up, cardio exercises of weight lifting, the body extracts glycogen from the muscles. Glycogens are mainly the energy storehouse of the body. So, if the level of glycogen decreases in the body, it also reduces the energy of the body. So, when you do cardio exercises before weight lifting, you use up many of the glycogen from your muscles and hence leaves your body with less amount of energy. But if you do cardio exercises after weight lifting, then you can perform your weight lifting session more efficiently due to more amount of energy. This is the reason, when while in a competition or sports, weight lifters are provided the proper amount of rest after each lifting session so that they can gain back the energy in their body.