Not the worst situation in the world, no. You're probably already quite alright taking the train (or bus, but this sounds like a train situation), given that it's also a form of active transportation. Plenty of light exercise to be had when taking transit.
Maybe living closer to where you have to work everyday would fix that. Of course in north america we've made it very difficult to build in existing city land and instead we keep building more and more satellite communties that commute to an urban center, and then ruin that urban center by constantly driving and parking cars where many people are trying to work and live. So living close to work has become very difficult for many people.