Research on circadian rhythms (your body's internal clock) indicate that the summation of several important anabolic hormones peak at 3 and 11 hours upon awakening. What does that mean in plain English? Well, according to science, if you wake up at 6:00 am, you're at your strongest at 9:00 am and 5:00 pm. And, according to Olympic strength coach Charles Poliquin, your joints - specifically, the synovial fluid that lubricates your joints - require about 3 hours to reach an optimal level of warmth, which will help improve performance while decreasing the likelihood of injury.