When it comes to speed and control there is no question that the skinnier you are the better agility and control you will have on an ATV. Does this mean that those of us who suffer from the affects of too many years behind a desk should not ride? No, absolutely not. But when it comes to people of different body types riding together the laws of physics do not permit people to have the same ability to go around corners safely at the same speed. Those with greater body mass require slower speeds in order to make a turn and not loose control. The laws of physics require that momentum travel in a strait line. The same laws of physics apply to ATVs.