roller-skating

Ball bearings were added in the 1880s to make roller skating smoother.

Toe stops for braking were first introduced in the 1850s, but larger rubber ones became common in the 1950s.

skateboarding

Skateboarding is a sport where you ride on a small board with wheels.

Most skateboards are about 32 inches long and 9 inches wide. A skateboard has three main parts: the deck, trucks, and wheels.

snowboarding

A snowboard is like a large skateboard with foot bindings. They’re usually 5 feet long, 10 inches wide, and shaped for easy turns.

freestyle skiing

Skiers jump from a 34-39° ramp, judged on:

Routine performance (50%)

Takeoff height (20%)

Landing quality (30%)

cycling

In World Championships, men compete in two age groups: Under 23 and Over 23.

They participate in three types of events:

Time trials

One-day classic rides (200-280km)

Multiday stage races

BMX

BMX racing tracks are 275-400 meters long and feature varied layouts and obstacles.

They all start with a wide, uphill gate where riders can quickly speed down the track.

skydiving

Skydivers jump from high altitudes and freefall for 40-85 seconds. Their speed depends on factors like altitude, parachute deployment, and body position. They can reach up to 130mph “belly to earth”.