There are over 300,000 active skydivers in the United States. Stepping into the doorway of a plane at 13,500 feet and leaping for an adrenaline-filled free fall is a feeling like no other. For those interested in trying this sport, a tandem ride where you are strapped together with a certified instructor is an easy way to see what skydiving is all about. And just about anyone can drive in off the street and try it. We visited Vermont Skydiving Adventures in Addison and went up in the plane to watch first-timers take exhilarating tandem rides.