So how'd Chris and Shelley Duncan both get hernias?  Trying to out-lift one another.

http://sports.espn.go.com/mlb/news/story?id=3031839

"I'd go and then he would put another plate on, then I would go and I'd try to slip one on, and the next thing you know we're like blown out," Chris Duncan said. "We can't work out together, it gets too competitive."

Chris is done for the year, and Shelley's had precisely three at-bats in the last 17 days.  Methinks they won't be doing this again?