Women's hormones ebb and flow based on a monthly cycle. Learn when to lift heavy, complete intervals, do aerobic work, and rest; when to plan projects, be social, and relax at home. When you understand the inner workings of your unique biology, you will be freed from the frustrations of failing another diet or work out plan. Instead, find the proper diet, rest, exercise, and stress reduction for each phase of your cycle. Every day shouldn't be the same as the last, but it should be as equally fulfilling.