Best For: The golf-and-tennis set
The Four Seasons of fitness travel, IMG's International Performance Institute occupies a 300-acre campus near Sarasota Bay and combines intense physical and mental conditioning with micronutrient instruction. Clients have access to a full-service spa and work out alongside pro athletes—Kobe Bryant and Maria Sharapova have both trained here. IMG earned its rep by developing tennis stars like Andre Agassi, and it still has some of the best coaches in the country. Guests looking to fortify their backhands can enroll in the Pro Max program, which combines tennis training with massage therapy and videotape analysis. Visitors wanting more luxury can stay near the golf course in three-bedroom villas with private pools. $2,225 for five days of workouts and meals; villas from $495; imgacademies.com