I think I'm going to pass out

I just finished level 1 of Jillian Michaels 30 day shred. I almost passed out, twice. But I finished it, all 20 min. I haven't done jumping jacks in years but she uses lots of them, and they are awful. However, I bet I burned a lot of calories so I feel good that I got some serious exercise in today. Maybe I'll try again tomorrow and see what happens!