Hammocks are a great way to relax in the summer but they can also be extremely dangerous if not used properly. Kendra Muller was relaxing in a hammock attached to two brick pillars used to hold up a deck. The brick column collapsed on top of Muller. The accident left her a quadriplegic. She had to learn how to eat, speak and breathe all over again. Expert Derek Hansen, who sleeps in a hammock every night and runs the website The Ultimate Hang, provided some of his top tips to Inside Edition.