Question: I've been working out M-F for about one hour. I do 20-25 minutes of cardio, then hit the weights. Should I change my workout?
Answer: I would switch it up like this: 5 minute warm-up, 25 minutes of weight training, and finish with 30 minutes of cardio. You need to warm up your muscles before you train them, and then need to burn off all of that blood sugar during your weight training which is your energy source. By the end of your weight training you will be more depleted of energy and your heart rate will already be elevated, therefore, when you begin your cardio your heart rate is already elevated and you get a full 30 minutes more of intense cardio.