‘Tis the time for exercise. Nothing inspires a person to spring into action, body management-wise, faster than the prospect of leaving the house in a summer ensemble that’s snugger, in a debilitating sort of way, than it was last year. There are all sorts of ways that an environment can support physical action by humans and continued activity over time—there’s a reason why the floors in the spaces where ballet companies practice and perform are so carefully designed, for example. …