and if so, does it help your progress?
Usually there are three scenarios where I do that.
1) Knees/elbows are killing me.
2) I'm feeling to tired or exhausted (particularly if the carbs are low).
3) I lack access to a legitimate gym (i.e. the multi-station I had to use at my girlfriend's apartment complex back in 2001). Then, it's time for pre-exhaust supersets.