Why create a hit show of your own when somebody else's is just ripe for the copying? That seems to be ABC's thinking in greenlighting Too Big to Walk?. In the Biggest Loser rip-off - a U.K. import that thankfully will get a new title before it airs here - tubby contestants power-walk across the country, presumably being forced to pass by one Burger King after another along the way. It could debut as early as this summer.