A hundred and tewnty-five years after the first U.S. roller coaster, the coaster arms race is still testing the extremes of height and speed—:and increasingly the limits of the human body.

One of today's big guns, Top Thrill Dragster, may not offer much in the way of classical winding twists and turns, but delivers the high octane thrills of its namesake.

The coaster towers 42 stories above terra firma at the Cedar Point in Ohio and takes riders from 0 to 120 miles an hour (190 kilometers an hour) in a breathtaking four seconds.

My stomach doesn't like roller coasters or rides that are too wild. I have a very tame tummy.