It's canny for people like me who have osteoarthritis and hips gradually crumbling away. My mind tells me to run around like I did 30 odd years ago, but my limbs have given up the ghost.
I could do gentle walking but it gets so tedious. I used to play football, rugby, tennis and cricket, and also coached football, so still being able to be active in sport is as good for the mind as it is for the body.
A misplaced pass can still have you chasing the ball like an Olympic race walker, mind!