The crossword solutions for the term THEY GO DOWNHILL FAST are SKIERS (6 letters) and SLEDS (5 letters). Skiing and sledding are two popular winter activities that involve going downhill quickly. Skiing is done on skis, which are long, narrow pieces of wood or plastic that attach to the feet and allow the skier to glide down a hill. Sledding is done on a sled, which is a flat, lightweight vehicle with runners that allows the rider to slide down a hill. Both skiing and sledding can be dangerous if done without proper safety precautions.