Cardinals hitting coach Mark McGwire knows it when he sees it, having played the latter part of his career as an elite hitter with a back that rebelled against his swings.

He also knows there's no way Matt Holliday will surrender to it.

"I'm sure he'd say his back is fine," McGwire said after Monday's game. "But it's not 100 percent. It's not. But he's out there. That's key. He's out there busting his rear end, making it still happen and that's what it takes."