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Leaning back on the pool edge, lower your legs straight down and then raise them up as high as you can, keeping legs perfectly straight and together. The water provides extra difficulty because you have to fight your body's natural buoyancy to maintain control.
Tip: If this is too difficult (yes, I know our girl is making this look easy, but it can be tough with the water pushing down on you), sit on the edge of the pool and perform the movement from there.
The best exercises to blast fat and tone your whole body in water