A swimmer's body is made up of many moving parts: arms, legs, hands, feet, back, hips. The most powerful swimmers are those who are able to connect all of those parts beneficially with awareness and core tension.
Yoga brings body awareness into the arsenal of the swimmer. During a yoga practice, a swimmer executes different poses and flow sequences which teach the swimmer "functional strength," developing core stability and body positions in both dynamic and static states.
This improved body awareness also impacts endurance, injury prevention, stress response, and power in the pool. It can even impact a swimmer's confidence: "Simply holding one's body in open expansive postures for only a couple moments can produce meaningful elevations in testosterone and decreases in cortisol as well as increased feelings of power and tolerance for more risk" (A Champion's Mind, J. Afremow).