Seth Enslow set by Doug Danger. He started practicing by jumping ramp jumps over kegs of beer, cars, motorcycle and other big objects at different events. In 1999, he broke Robbie Knievel's (son of Evel Knievel) record for most motorcycle jumps. However, Enslow's triple clamps broke, which disconnected his front end from the frame, resulting in Enslow diving head first into the asphalt. But Enslow was soon on his feet and even signing autographs before leaving the venue. In 1999, Enslow made his first attempt to break the overall record at fellow motocross rider Mike Cinqmars' property with a ramp designed by
Half marathon world record progression the official distance in 1966) are extant today. The earliest half marathon world record accepted by the Association of Track and Field Statisticians is that of 67:01 minutes ran by Englishman Brian Hill-Cottingham in Romford in 1960. For women, the earliest ARRS-recognised time is that of American Kathy Gibbons, who finished the distance in 83:56 on 7 March 1971 in Phoenix, Arizona. The earliest men's and women's marks recognised as world records by the IAAF are 65:44 set by Ron Hill in 1965 and 75:04 set by Marty Cooksey in 1978. Key: Half marathon world record progression The world record