Matt Bomer
I have it and I ended up skiping to level 2 cause I got bored of level 1. It is difficult at first but you get through it. I agree that don't do it everyday cause my knees were hurting and I don't want to screw them up.

I suggest you change it up. There is a chart with all these work outs that I do between the 30 day shred, if you want it.