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The (1) sport of free-diving is any underwater activity which people do by holding their breath for a long time. People (2) try to dive down as far as possible on a single breath, without the (3) use of air tanks. Many divers say the experience of free-diving gives them a (4) feeling of deep peace while they are underwater. Also, many of the sport's (5) enthusiasts regularly use yoga to (6) help them focus and hold their breath for longer than normal, so they can dive to a much greater (7) depth. Before you decide to try free-diving, you must go through (8) a lot of training first under the (9) guidance of a professional. This is because it can be a very (10) dangerous sport if it's not done properly.