For centuries human beings have been fascinated with the idea of flying like birds. People have never ＿＿（41）＿＿ to figure out how birds manage to fly. As technology advances, this dream now comes closer to reality with wingsuit flying, ＿＿（42）＿＿ is a highly specialized form of skydiving through the use of a unique suit. This suit makes it possible for an extreme athlete ＿＿（43）＿＿ over hills and valleys like a bird while enjoying the incredible views below. Obviously, the secret to wingsuit flying ＿＿（44）＿＿ the wingsuit itself. The wingsuit is specially designed to increase the surface area of the human body. Webbing under arms and between legs is made of strong fabric and mimics the structure of a bird's wings. Air cells on the webbing inflate when they catch the air. ＿＿（45）＿＿ , a wingsuit allows an extreme athlete to descend at a slower rate, stay in freefall longer, and travel much greater distances. The longest distance of wingsuit gliding on record spans 11 miles.