How hard would you say this effort was? What kind of an effort was it?
High effort overall, with intermittent lower effort if I need to back off. Workout is a 45-60 minute Dance Dance Revolution session, doing the hardest songs I can, occasionally broken up with some mid-difficulty songs if my HR gets too high. The track list is custom from online stepmania stuff, so longer songs in many cases and harder than a lot of the stuff in the original games.
Heart rate drops fairly quickly between songs, as you can see on the graph I posted in the comments.