If this is a goal, rethink the approach.
30 Day Shred is rated advanced at
www.collagevideo.com.
If you aren't quite ready for that, perhaps take on an intermediate or intermediate/advanced DVD for a while to build up the endurance/strength and then come back to the advanced 30 day shred to see if you get up and over the jumping jacks hump?
It's challenging for you -- it isn't that you are a FAILURE. You just aren't there yet.
And speaking as an beginner/adv beginner DVD person, I'm like "Dude! I can barely stand to just WATCH 30 day shred and she's up there doing level 1 all but the jumping jacks! WTG!"
We all progress in fitness at our own speeds. Take heart.
GL!
A.