Valentina Cruz trained professional dancers in Buenos Aires for five years before moving to Los Angeles, where she promptly realized that Hollywood actors have worse bodies than most people assume and a lot more money to fix that. Her "Dancer's Strength" methodology — which combines Pilates reformer work with compound lifting — is so effective that she's had to refer clients to two other trainers she personally vetted just to manage demand. (She vetted them the way you'd imagine: with a stopwatch and no mercy.) At $250 a session, her calendar is still full three months in advance. The workout is beautiful to watch, brutal to do, and produces the kind of lean muscle that makes people assume you've had work done. You haven't. You just found Valentina.