The late gentleman, comic, actor and all round genius that was Robin Williams was known for his emotional instability, he was an obsessive sort of chap according to sources close to him. Computer games was one of his addictions, which he felt compounded his depression and general low moods.
On the other hand, EXERCISE (particularly cycling) was his release:
One of Robin’s close friends said:
“Robin loved to cycle and staying fit and active, however, the fear of losing control of one's body, and not being able to exercise - which is a major mood elevator for lots of athletes - was frightening to him”.
Williams' said: "Cycling saved my life… "
Cycling was his release, exercise kept him sane, but once his Parkinson’s diagnosis began to take a hold he seemed to deteriorate emotionally. Parkinson’s is a chronic degenerative condition, this further compounded Robin’s mood and depression, but what is clear is that exercise picked him up, exercise was his medicine.
If you want to maximise wellbeing, health and prosperity, NEVER overlook exercise, it’s a natural human endeavour, it’s as important to us as the air we breathe.
Source
The Telegraph, (2015). Robin Williams couldn’t bear 'seeing his senses being stripped away' by Parkinson’s, friend reveals. Retrieved 5th June, 2015, from http://www.telegraph.co.uk/news/worldnews/northamerica/usa/11035744/Robin-Williams-couldnt-bear-seeing-his-senses-being-stripped-away-by-Parkinsons-friend-reveals.html