Clay Matthews' Workout Style

It's no question Clay Matthews works out a lot.  Just look at the dude.

Ripped?  Yes.

How he gets there is plenty of time spent in the gym, but I was wondering what kind of workout style he selects once he's in there lifting weights and working on cardio.  Up above he's got a classic Nike black T, and just cut out of the picture are a pair of black gloves.  The hair is pulled back in a simply pony (?) and he looks ready to sweat.  Here's a few more pictures of Clay Matthews' workout style:

The black shirts and pony tails are there...just with an added headband.  So what do you guys think of Clay Matthews' workout style?  Thumbs up?  Is he operating with a Nike endorsement?  Look good in black?  Leave me your thoughts!