Active recovery means that in between your "sprint" intervals, you just don't sit around doing nothing. You keep moving and "actively recover".

For example, when you're sled pulling, you'd sprint for 20 seconds, walk for 10 seconds, sprint for 20 second, walk for 10 seconds, etc etc.

What I'm saying is in between you "sprint" intervals on the heavy bag, you do jumping jacks during the recovery phase.