Treadmills, ellipticals & cycles boost heart rates near hanging HDTVs while free weights challenge muscle groups in gym with 24-hour access

Trainers build long, lean muscles through boutique-style fitness classes, including barre, boot-camp, Zumba & cardio-kickboxing sessions

Certified CrossFit coaches train kids, teens & adults in maneuvers for intense workouts involving kettlebells, swings, lifts & rowing

Stationary bikes carry riders through more than 10 classes that combine yoga, intervals & weight training into full body workouts

Neighborhood gym in Cleveland Park with cardio equipment, weight machines & classes including Pilates, World Dance & boxing

Mommy instructors encourage fitness-minded maters to squat & lunge through rounds of patty cake with tots aged two months & older

Indoor cycling studio’s black-lit neon murals, upbeat tunes & flat screens with dancing images motivate riders through one-hour workouts

Boutique studio's trainers help clients achieve fitness goals during personal-training sessions & fitness assessment

Pro ballerina creates classes designed to whittle abs & foster flexibility with free weights & techniques from ballet & Pilates

New location for established studio pairs students with reformer machines that boost range of motion in classes that tone & fortify cores