Speedflex

It’s easy to see why City types love Speedflex. The gym is plush and expensive-feeling (think marble fittings in changing rooms), and its workouts brutal and efficient. Less than ten minutes in, you can expect a face redder than a baboon’s bottom. The workout room is dominated by seven intimidating machines which calculate resistance based on your own force. The point is high intensity training without next-day soreness. Speedflex is about leanness rather than muscle building, so you won’t end up with Madonna’s arms.