Hi all, I'm Emoore and I started boxing all of a week ago.

I found a good local gym and I'm working with a trainer for an hour and a half to two hours on Monday, Wednesday, and Friday mornings. He's been having me work through Shadowboxing, hitting the heavy bag, the speed bag, and the double-ended bag, hitting the mitts, and some plyomentrics.
What should I do on the days I don't go? I'd like to lose 20-25 pounds, which I know has a lot to do with nutrition and I am working on my diet.
Should I do some body-weight exercises? Some running or jumping rope? Plyos? Underwater basket weaving?
Thanks!