It sounds hokey, and I was completely skeptical at first, but it turns out that in a study conducted at McMaster University in Canada, resistance training actually rejuvenates muscle tissue in healthy seniors. Tissue samples taken from the thigh muscles of 25 healthy older men and women who underwent six months of twice-weekly resistance training on standard gym equipment compared to a similar analysis of tissue samples taken from younger people. The seniors, who had an average age of 70, also increased their muscle strength. The twice-weekly sessions took an hour and involved working each muscle group in the body. So, what does this mean to you? Well, first it's never to late to begin an exercise program, and if you're still young, you may only have to do resistance training twice a week, along with some form of aerobic exercise to keep your body looking and feeling like the picture of youth.