P90X tore me up

During my "lazy" 3 days off, I did a very simple P90X ab workout.  It's only 16 minutes long and I got through it just fine with good form.  The next day I started feeling it.  Today my demolished hip flexer muscles were creating a dangerous (and hilarious looking) walking situation.  I found it most comfortable to walk around bent significantly at the hips, sort of staring at the ground.  Probably pretty funny to watch.  I looked like a geriatric patient walking around.  I'm not looking foward to a weights workout this morning with Club Wolverine.  I'm already pretty worn down after P90X and a single 5,000 meter workout.  As we used to say at EMU:

HERE COMES THE PAIN!