Do five or ten minutes of light exercise before lifting, followed by a few light to intermediate sets of warm-up lifts.Xtreme Fit 360 Keep your workouts to a sixty-minute maximum length. After sixty minutes, your body will begin to produce increased amounts of the stress hormone, cortisol. Cortisol blocks testosterone, which causes less efficiency during workouts. If you keep your workouts under sixty minutes, you will reap the rewards of your efforts faster and enjoy the benefits of your hard work.Xtreme Fit 360 Carbohydrates are key for muscle building.