Most people who do a lot of exercise, particularly in the form of competitive athletics, have unneurotic, extraverted, optimistic personalities to begin with. (Marathon runners are exceptions to this.)
Robert M. SapolskyThe regulation of genes is often more interesting than the genes themselves, and it's the environment that regulates genes.
Robert M. SapolskyWe're getting along so well; I trust you so much for this one second that I'm going to let you yank on me.
Robert M. Sapolsky