28 Unlocked's unique approach toward fitness syncs the intensity and type of exercise to the fluctuation of hormones in a woman's body making this program ideal for women prior to menopause. Maximize muscle gains when your body is most capable of it. Burn fat in the second half of your cycle with high intensity and interval training workouts when its most efficient to do so. Recover when your body needs it the most at the end and beginning of your cycle. So, start working smarter not harder!