Scuba diving is swimming underwater, or taking part in another activity, while using a scuba set. By carrying a source of breathing gas (usually compressed air), the scuba diver is able to stay underwater longer than with the simple breath-holding techniques used in snorkeling and free-diving, and is not hindered by air lines to a remote air source. The scuba diver typically swims underwater by using fins attached to the feet. However, some divers also move around with the assistance of a DPV (diver propulsion vehicle), commonly called a "scooter", or by using surface-tethered devices called sleds pulled by a boat.

 Fishing is the activity of catching fish. Fishing techniques include netting, trapping, angling and hand gathering. There are many techniques for fishing. Fishermen may use hooks and fishing line. Fishing nets, fish traps, and trap nets may be used to capture fish. Almost any equipment or gear used when fishing can be called "fishing tackle". Some examples of tackle are lures and bait, lines, rods and reels, nets and trawls, downriggers and outriggers, gaffs and harpoons, clevises, floats, and traps. Gear that is attached to the end of a fishing line, such as hooks, leaders, swivels, sinkers and snaps, is called "terminal tackle".

A water sport is a form of recreation where water is an essential aspect of the activity. Tubing, also known as inner tubing or even toobing, is a recreational activity of riding an inner tube, either on water, snow, or through the air. The tubes themselves are also known as "donuts" or "biscuits" because of their shape.

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