Tim McGraw brings a powerful song to one of the National Geographic documentaries. With the help of co-writer Lori McKenna, Tim McGraw wrote "Gravity" for National Geographic documentary "Free Solo". "Free Solo" is about 33 year old Alex Honnold who is known as one of the best free solo big wall climbers. Honnold holds the only title as the only person who has climbed free soloed El Capitan at Yosemite National Park.
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