Zip lines used to be just for the extreme adventurer. In 2001, there were just 10 commercial zip lines. But in 2012, there were more than 200. There are 13,000 amateur ones in camps and even backyards ...
Gravity is one of more than 300 major commercial zip lines and canopy tours worldwide, with about 115 of them in the United States, said Jeff Coy, a hotel, resort and waterpark industry consultant.
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