Seriously, how could 20 minutes of exercise make your whole body feel like rubber. I stepped back on to the shred train this morning...back at level 1. I could withstand it without wishing for death, but seriously...it's like my arms and legs are rubber now. I haven't shredded since last May's 30 day shred-athon. I'd take 45 minutes of Pilates over 20 minutes of the shred any day...but I can't find 45 minutes in my day...20 I can do before I jump in the shower.