This is because the buoyancy of the water supports the whole body while providing an environment of natural resistance that increases your energy expenditure with every movement, calling into action almost every major muscle group in the body.
(This; is; because the buoyancy of the water supports the whole body while providing an environment of natural resistance) (the buoyancy of the water; supports; the whole body; T:while providing an environment of natural resistance) (an environment of natural resistance; increases; your energy expenditure)
This the buoyancy of the water an environment of natural resistance
is supports increases
because the buoyancy of the water supports the whole body while providing an environment of natural resistance
the whole body T:while providing an environment of natural resistance
your energy expenditure