In watercraft, a racing shell (also referre to as just a fine boat (UK) or just shell) is an extremely narrow, and often disproportionately long, rowing boat specifically designed for racing or exercise. It is outfitted with long oars, outriggers to hold the oarlocks away for the boat, and sliding seats. The boat's long length and semicircular cross-section reduce drag to a minimum. This makes the boat both fast and unstable. It must be actively balanced by the rowers to avoid tipping. Being able to balance, or "set" the boat while putting maximum effort into the oars is therefore an essential skill of rowing.