Yes, exactly; it's completely up to you. Having exercise as part of your commute means that you don't get to put it off because you're busy with work, or you've

Yes, exactly; it's completely up to you. Having exercise as part of your commute means that you don't get to put it off because you're busy with work, or you've got chores to run, or you don't feel like it, and then a few days go by and you've lost the habit.