I get motion sickness but was fine on Dinosaur...However, it threw my back out and I walked crooked around the parks for 2 days and stayed up to the minute with my Motrin--I hve never had any previous back problems--I guess I was sitting in a strange way and was tense waiting for the dinos to jump at me. But it is very jerky regardless of how I was sitting. Beware...(BTW, my 8 year old loved it!)