Go to sleep and the next morning go back to the list. Don't be surprised if some answers come up. Just write them down. It is also good to jot down the jist of any dreams you are aware of as you awake. Your body was made to be used.
Activity stimulates new cell growth, both muscle, bone and blood.
You feel better, sleep better and feel more virility when you exercise. Exercise should, however, be reasonable for your age and physical limits. A soft surface unlike asphalt or cement is preferred as well as supportive footwear. Weight training has now been proven to increase strength and flexibility in even the oldest seniors. The current thinking on overcoming the effects of arthritis is also exercise, and of course, we now know that even 90 year olds can lift 1-2 lb. dumbbells and benefit.