Random Riddle: 2000 Push-ups

Jon and Bob were betting on a baseball game and Bob lost. To get back at him, he bets Jon.

Bob says, “I bet you I can do two to three thousand push-ups in 10 minutes.”

Jon says, “Fine, let’s see it. You couldn’t possibly win that bet.”

Bob won the bet. How is that possible?
 

Random Riddle: 2000 Push-ups