Freestyle Moto-Cross is a radical sport designed to thrill spectators with a high-profile packaged form of off-road riding. The riders are pure athletes who have taken the sport of Moto-Cross to the next level of entertainment and perform acrobatic stunts over ramps between 50 to 90 feet long. The machines are modified Moto-Cross bikes with stiffer suspension designed to cope with the hard landings. The motorcycles also have a number of other modifications essential to equip them for the strains and stresses of this extreme sport. Riders frequently sail between ramps at heights approaching 40 feet. The further the jump and the higher the altitude, the longer the period of negative G-force and the more ambitious the resultant antics.