https://www.nytimes.com/2017/05/10/well/move/noisy-knees-arthritis-may-be-in-your-future.html?hpw&rref=health&action=click&pgtype=Homepage&module=well-region®ion=bottom-well&WT.nav=bottom-well&_r=0
A bunch of old guys still enjoying the mountains, and the training they need to do to get off the couch