P90X after Day 4

So... I barely survived Day 1 of P90X. I will openly admit: P90X Core Synergistics is the most painful thing I've ever done. So far. LOL. Day 1 worked my abdomen, my arms, and my poor thighs!!! I woke up on Day 2 with a sore... well... sore everything! I stayed lying in bed for about 10 minutes before attempting to roll from my side of the bed to my other half's side - yes, I was groaning the whole way - to roll off the bed.