Dr. Stacy Sims is a senior research scientist, and entrepreneur in human performance, specifically sex differences in training, nutrition, and environmental conditions. Today Dr. Sims and I will be de-mystifying the menstrual cycle and highlighting how the different phases affect your fitness, the fluctuations in fuel utilisation, and your ability to recover, the launch of her new online, and the strong need for more research on women in sport and exercise. For more information head to www.sarahlizking.com