, swimming, and weight lifting are great most of the year, as part of low-key training months when your main goals are general fitness and injury prevention, but the heavy training month before a big race needs to be a month of living a little dangerously
. By not taking in carbohydrate drinks or energy gels during the run, you're giving your body no choice but to go to fat-burning. You will feel fatigued near the end, but that's necessary if you want to get stronger." Should you try it? Don't go out
