abby delaney: log rolling is a traditional north american sport.ted in the late 1800s, with the great river long drives when men were chopping trees down all winter long. and then in the springtime, when the rivers were flowing fast and high, they would send the logs downriver, out of the forest to the saw mills. but what happens when you step on a log in the water? johnny bananas: it rolls. abby delaney: it starts to roll. so they had to learn how to roll on top of the log. johnny bananas: how did you get into this? abby delaney: my mom is log rolling champion. am i supposed to try to keep him on? she tricked me. i started log rolling as soon as i could walk and swim, competed in the sport. and we wanted to give more people access to it, so we started a club. johnny devenanzio: because it's not exactly convenient for competitors to carry a 600-pound wooden log-- oh, he's, like, got it all by himself. i got this. we developed the key log, portable synthetic log that can go anywhere in the world. can you show me which way to the lake? and it weighs