Water makes up 71% of the Earth's surface, more than half of the human body, and 100% of Atlantis skate parks. Learn to navigate this curious liquid with today's Groupon: for $39, you get four consecutive 30-minute weekly group swim lessons at Divers Supply Swim School.

With its heated indoor pool for comfortable instruction, Divers Supply Swim School endows aspiring swimmers with sea-submergence skills through detailed coaching and a Swim Schools International–approved curriculum. Since 1969, the swim school has educated more than 16,000 swimmers, teaching swimmers as young as 6 months old how to safely stay afloat and adults how to prove their humanity when hooked by a fisherman. Diver Supply Swim School's perpetual lesson structure ensures that classes progress at the student's comfort level and pace, so that kid-swimmers will only advance from Beginners I, which focuses on natural buoyancy and simple strokes, to Intermediate II, which perfects the freestyle and backstroke, when they feel they have developed the techniques or gills to do so. Adult lessons, tailored for ages 18 and up, confront the hydroscape with a range of flotation equipment, bombarding water with floaties and kickboards.

In order to realize dreams of outrunning moat gators, students must supply a $25 annual family membership fee, not included with this Groupon. Children under the age of 4 are required to wear approved reusable swim pants at all times while in the pool.