In which winter sport might you perform tricks called 'ollies' and 'butters'?

Snowboarding is a recreational activity and Olympic and Paralympic sport that involves descending a snow-covered slope while standing on a snowboard attached to a rider's feet.

The development of snowboarding was inspired by skateboarding, sledding, surfing and skiing. It was developed in the United States in the 1960s and became a Winter Olympic Sport at Nagano in 1998.

An ollie is a trick in which the snowboarder springs off the tail of the board and into the air. A butter is performed while traveling along the surface of the snow, this trick is performed by pressuring either the nose or tail of the snowboard in such a way that the opposite half of the snowboard lifts off of the snow, allowing for a pivot-like rotation. A butter can be performed as a partial rotation (90°), which is then reverted, as a continuous rotation (180°, 360°, etc.), or as a lead-in to an aerial maneuver.