1. Switch-hitting: It's tough enough to stand in the batter's box and hit a baseball traveling at you nearly 100 miles an hour. But imagine being able to do that from either side of the plate, either righty or lefty. I can barely even use my iPod left-handed.

2. Playing cornerback: You know how fast and agile wide receivers are? Then imagine trying to run alongside them, but backwards.

3. Rebounding in the NBA: You'll hear basketball analysts talk about guys who have "a knack for rebounding," but the truth is rebounding is a skill. You have to fight to keep huge opposing players away from the rim while keeping an eye on the basketball and simultaneously gauging the angles of a possible rebound. No wonder Dennis Rodman lost his mind.

4. Returning a tennis serve: Having never played tennis on a high level, I'm assuming there's a lot of guesswork involved in this. Either way, standing cross-court from a 100+ mph serve and then trying to hit a return that poses any kind of challenge seems like it would be impossible.

5. Returning a punt/kick-off: This looks relatively simple on TV: You get the ball, follow your blockers and then look for a hole to run through. But after playing EA's NCAA football game, in which you can return kicks using a ground-level view, I now realize it's nearly impossible to get much more than 15-20 yards on a return. You need to be elusive, blazing fast, tough, creative -- a skill set that doesn't exactly grow on trees.