Promises, Promises!” Is there any time people are more obsessed with health habits than now? The “beach body” craze of late May turns up the level of hype. Every time you turn the corner, somebody else is trying to get you to try a class, a supplement, a shake, a piece of equipment, a diet, a lifestyle … and it can be exhausting trying to figure out what’s bona fide and what’s bogus. Here’s a little guidance on whether to put money down on that hot new habit. Does it promise