P90X hybrid - Day 12

Legs and Back.  Ow.  Did half decent until I got some kind of cramp or tweak in one of my quads.  Was able to finish but had to skip the last two lunge exercises.  My calves were on FIRE today.  I dropped the weights down to 10lbs on the calf burners.  I think will be sore, but not as bad as last week.