training appealing to the general public, fueling the fitness boom of the 1970s and 80s and resulting in Nautilus gyms in strip malls across America. Nautilus, Inc. markets the Bowflex, Stairmaster and Nautilus product lines. These new product lines are not affiliated with Jones. The Bowflex "power rod" bending technology is in part based on Jones's ideas due to its use of variable resistance. The Nautilus machines and the company he formed to sell them made Jones a multimillionaire and landed him on the Forbes list of the 400 richest people. At one point, financial analysts estimated that Nautilus was grossing $400 million annually. He sold Nautilus Inc. in 1986 for $23 million. He also sold MedX Corporation in 1996 and then retired. On August 28, 2007, Jones died from natural causes at his home in Ocala, Florida, at age 80. He was survived by two daughters and by two sons, Gary and William Edgar Jones. Gary Jones created Hammer Strength strength training machines. Inventions Arthur Jones was a prolific inventor, holding numerous patents (many of which were assigned to Nautilus or MedX), most notably the elliptical cam (which replaces the pulley) to provide variable resistance through the range of motion. Other interests Jones often prided himself on being a generalist, something which he describes as a move away from the stubbornness and short-sightedness of 'specialists'. He attributed this in part to his upbringing in a family of physicians, as he found their attitudes toward medicine revolved around what they were taught and nothing else. One of his favorite quotes was Robert A. Heinlein's "specialization is for insects." He often cited that his observations gained from flying allowed him to understand the requirements for developing exercise machines. He believed in the competent man, that, as Heinlein also said, "a man should be able to put food on the table, build a house, tan a hide and deliver a baby." Jones traveled and 'adventured' widely, occasionally with friend and fellow adventurer Roy Pinney (Jones's cameraman for a syndicated TV series called Wild Cargo), setting up camp for two years or so at a time in different places such as Rhodesia (now Zimbabwe) and Mexico City. His motto was "younger women, faster airplanes, and bigger crocodiles." Jones's Lake Helen, Florida, Nautilus building was the home of Gomek, an 18-foot salt water crocodile that Jones was trying to grow to world record size.