Yup, tradeoffs, all the way down. Sure, you can exercise afterwards, but then you give up something else. It might be de-stressing time in front of the TV, or chat time with friends and family. Or it might make you tired and achy for the rest of the day, lessening the fun there.

It's easy to say "just balance it", but all of it has been attempting to balance things, and some people, including myself, repeatedly chose the side that had risks and consequences later so that they could enjoy the moment.