Editor's note: The paragraph on "Fitness Shoes" (including Sketchers' ShapeUp and Reebok's EasyTone) has been removed pending further inquiry from Forbes.
Shoe-maker Skechers, which has also made its name with celebrity endorsements in addition to its line of Shape-Ups fitness shoes scooted into number 8.
Of the former, almost 33m belong to health clubs, spawning a multi-billion-dollar industry of sports shoes, fitness foods, exercise videos, heart monitors and personal trainers.