You don't need a lot of muscle mass to stay strong enough to avoid injury. Any form of regular medium intensity exercise will probably be fine from that point o

You don't need a lot of muscle mass to stay strong enough to avoid injury. Any form of regular medium intensity exercise will probably be fine from that point of view. Of course if you want to build big muscles, that's fine. I am always a little wary of people extolling the health benefits of doing so. Eating well and doing a moderate amount of exercise will get you 90% of the way to any purely health-related benefits that you'll get from more intense exercise. And more intense forms of exercise carry their own non-negligible risk of injury. Attitudes to health, diet and exercise seem increasingly to vacillate between extremes. There's a happy medium between sitting on your couch eating cheetos and straining to lift huge weights four times a week.