Bruce hadn't said much after he escorted Robin off the premises. He just wanted to go and work out. He's mad at the kid, mad at himself. And doesn't want to think about parallel worlds; alternate versions of himself that might be doing all this better.
It's a hard workout. Running, weights, the heavy bag. Weapons, and then sparring. X is a great training partner, and she's got no qualms about beating the crap out of him when he asks it. It's only when he hits the deck for the twentieth time, and finds he can't physically make it back up again, does he hold a hand in the air.
'Think I'm done.'
His mind's more clear than it was. It can only concentrate on the physical pain he's in. He's glad of it.