I fully agree with you. I always take my running kit when travelling, and when a meeting finishes will tend to leave my bag, and go an do an hour in the local park in the light. Trying to arrange to meet one friend is hard enough, many? Near imposible. Even making it to running club once a week is <50% as it requires negotiating with wife work dealines, work travel, an so much more.

Cycling is similar - I know doctors who are avid cyclists as it works so well. When they are on call they have to be available and can't go anywhere... perfect for the turbo trainer.