How to Stay Young

…If you’re active.

Those of you who have kept in shape can still perform your favorite fitness activities. There is no reason for you to give up running if you still feel good while doing it. The one thing you will notice is that you don’t recover nearly as fast as you used to. If you challenge yourself fitness-wise (and you should, occasionally) with a high intensity activity, remember to give yourself time to recover. You don’t have to take the next day off, just go light.

…If you’re sedentary.
It’s a good idea for the active folk to stay active. For you, getting active is a necessity. But you have to start slowly. You’ve lost a significant amount of muscle mass. Even worse, your joint, tendon, and ligament flexibility has gone into the toilet.
Focus on high intensity exercises that don’t jolt your joints. If you like the treadmill for instance, move the incline up and walk briskly uphill. This is better than keeping the incline flat and running. You will get a good workout without damaging your joints.