I have a good friend who almost falls off her bike if she tries to grab for her water bottle. This is nothing like that.
Bike Trials From Wikipedia:
Bike trials is a form of off-road cycling derived from motorcycle trials where one slowly negotiates man-made and natural obstacles. It originated in Spain and is said to have been invented by Ot Pi’s father (A world champion motocycle trials rider) who wanted his son to learn and practice motorcycle trials on an ordinary push bike instead of a motorbike as it is hard for small children to control motorcross trials bikes.
At the most basic level, trials riding can be summed up as bicycle handling skills. It evolved from motorcycle trial riding (riding up, over obstacles, man-made or natural) into an off-season bicycle pastime. It now has a strong, though small following and can be seen worldwide. Skills taken from trials riding can be used practically on any bicycle for balance, standing still while still on the pedals, braking, and many other uses. Trial bike characteristics include, but are not limited to: powerful brakes, wide handlebars, light parts, low gearing and a heavy emphasis on frame geometry.