I have an even easier way to do this.
First what SVNBob said but minus a few things
a: no reality stars
b: If you have to have a reality star, make it one of the hosts ie: Tom Bergeron, Carson Daly or Ryan Seacrest
c: no sports stars, unless they are now actors in a show ie: Mark Harmon in the old versions wasn't allowed to play quarterback
D: NO KARDASHIANS
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I think another reason this isn't done anymore is during the tug of war, all the weights were given out, even the ladies.