First, watch this video and learn how NOT to catapult a watermelon:

Second, it drives me crazy when people go on these shows and seem to give up at one bit of trouble!  Sure, she got a watermelon to the face, but she was able to sit and complain about it so why not keep going? She seems *shocked* that they are making her still do it!  YOU ARE PLAYING FOR A MILLION DOLLARS, SO START ACTING LIKE YOU WANT IT!  It reminds me of the bible verse about "winning the race" :

Don't you realize that in a race everyone runs, but only one person gets the prize? So run to win! 1 Cor. 9:24
Yeah, it's going to be hard and you might get a watermelon to the face, but isn't the prize worth it?  In our lives what is the most important thing and what will bring us the most joy?  Run today, and if you haven't run the race in a while, get off the couch and do something!