Get Your Best Water Workout

Speedo's Core Stabilizer suit, $98 (speedousa.com)

WHAT IT IS: A swimsuit constructed with the same NASA-designed precision as Michael Phelps' super-skintight number, but comfier (this amateur version boasts a knit fabric that has more give than that of the pros').

WHAT IT DOES: Its girdled core region keeps hips afloat for less drag and speedier stroking.

THE RESULT? A more efficient workout.

WHAT WE LOVE: The belly-flattening silhouette—and the bust-supporting, sewn-in sports bra.

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