What is Joba Chamberlain doing in the bullpen?

There was a roll of duct tape, a glove, some strange high-step sprinting? Joba Chamberlain even put on a catcher's mask and threw up a one-handed jump shot with no ball.

Yanks announcer John Flaherty attempted to explain the reliever's antics during the Bombers' 8-2 win over the Twins on Wednesday, but who really knows what he was doing? Does anybody ever know?

-- Matt Monagan / MLB.com