Manhattan's Gravity Fitness is charging customers $110 an hour for training session with the Nintendo Wii
. Trainers incorporate Wii sports games, like boxing, with traditional exercise sessions. The gym's executive director Mark Natale says the Wii is just another workout tool, like treadmills and elliptical trainers with attached video screens. For $50 an hour, I will drink margaritas poolside and train you to do laps.