Let’s face it, aging isn’t always glamorous. As we get older, our metabolism begins to slow, our muscles weaken and we’re not as fast or agile as we used to be. Thankfully, research shows that exercise, especially high intensity interval training, or HIIT, can help prevent weight gain, improve muscle strength and reverse the signs of aging. A new Mayo Clinic study indicates that high-intensity aerobic exercise can reverse some aspects of aging at the cellular level. In this study, researchers compared high-intensity interval training, resistance-only training, and combined exercise training in seventy-two healthy, but sedentary individuals for a twelve-week period. While all training types improved lean body mass and insulin sensitivity, only high-intensity interval training and combined training improved aerobic capacity and mitochondrial function. In addition, high-intensity training caused muscle enlargement, especially in older adults. This is significant because as we age the