Fitness instructors and personal trainers often tout the benefits of resistance bands. But can a three foot piece of rubber hose that fits in your pocket and costs about the same as a portion of fish and chips really give you the same kind of workout as a dedicated iron machine with its complex series of pulleys, stabilizers and adjustable weights that sets you back a couple of months’ salary? Surely a real man needs a manly machine for getting in shape and staying that way?