yes, there is a good reason for him doing the exercises, everybody else in the house laughs at me lol, my arthritis and old injuries mean that while I can demonstrate the basic positions, exercises requiring good stability and mobility make me look stupid when videoed. A lifetime of sport often pushed to the limits with coaches who understood how to get peak performance and skill from an athlete but no idea how to keep that athletes body functioning correctly in the long term has left my quite broken in some areas. I can keep the worst of the long term effects at bay by doing the right things now but old injuries combined with the effects of getting older server as an example of why the light weight maintenance exercises need to be done to prevent those injuries as much as possible.
Watching elite sport of all types is a popular pastime for many, but the after effects of a sports career on the body are almost never seen by the viewing public.