Pure cardio is a killer. It's one killer set without any rest. Eek! You know, I can't remember the exercises in pure cardio although I just did it a few days ago, hehe. I don't think you should wait for you calves to be back to normal, but you should do what you're most comfortable with. Or you can give it a try and if you feel like you need another day, stop and come back tomorrow. but remember not to be over indulgent with yourself. I tend to do that, hehe. Good luck!
As for me, I haven't worked out yet.
