Ballplayers practice swings during batting sessions in one of six cages

Month-long memberships boost fitness through yoga, circuit training, spinning, and conditioning classes and one-on-one personal training

Flirty Girl Booty Beat and Zumba tone with music and choreography; cardio kickboxing sculpts muscle with vigorous jazz funk

Seasoned instructors tone muscles with TRX, Piloxing, Zumba, interval-training, and boot-camp classes

The 30-minute workouts consist of high-intensity bodyweight and kettlebell exercises that strengthen clients

Techniques developed by famed speed-conditioning coach Loren Seagrave help develop speed, power, and agility; drink mix supports metabolism

Intimate boot-camp classes combine standard exercises and trainer-devised surprises; trainers tailor long-term plans to each student’s goals

Kids aged 18 months to 6 1/2 years learn dances and tumbling skills; tykes 5 and under cavort on inflatables and trampolines during open gym

High-energy Latin music inspires students to perform hip-hop dance moves and incinerate calories in fitness classes held six days a week

60-minute constantly changing, high-intensity workout of gymnastic movements, Olympic weightlifting, and metabolic conditioning