you’re over 50. Changes to our bodies after 50 present challenges that were not a concern in our 30s and 40s. Workout shortcuts we could get away with earlier in life can cause harm to aging bones and muscles. In addition, everyone else seems to know the ropes while you struggle to keep up. And if you get off to a bad start, that could color the way you feel about exercise for years and prevent you from ever sticking to a program. On the other hand, a positive experience makes it more likely you’ll enjoy the process and stay with it.