Kayaking is the use of a kayak for moving across water. It is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle (two). A kayak is defined by the International Canoe Federation as a boat where the paddler faces forward, legs in front, using a double-bladed paddle. Most kayaks have closed decks, although sit-on-top and inflatable kayaks are growing in popularity as well.