Fit NationHow is it that Americans are more obsessed with exercise than ever, and yet also unhealthier? Fit Nation explains how we got here and imagines how we might create a more inclusive, stronger future. If a shared American creed still exists, its a belief that exercise is integral to a life well lived. A century ago, working out was a strange subculture, but today, its almost impossible to avoid exhortations to exercise: Walk 5K to cure cancer! Ignite