Posted by Jackelope
You know we could talk different strategies for getting used to it all day long, but honestly the best way is to just get in there and do it. Whether you're road biking, doing BJJ, or power lifting, they all require certain endurance and certain strength. The best way to build endurance for each of those events is to do those actual events.
I'd consider leaning out and gaining more flexibility, but if you get in there and take it seriously you will naturally find yourself on that path.
Bingo. Just go to class and start rolling, you'll love it and your cardio will get better the more you roll because:
a. Your cardio will improve
b. You will learn to be more relaxed while on the mats
You could have the best cardio in the world but if you are tense the whole time you spar you won't last very long.