The Secret to Increased Productivity: Taking Time OffIt's not about how many brute hours you rack up -- it's about how effective you are at replenishing mental resources.

As a college buddy was recounting a great trip to Europe, something snapped inside Jeff Platt. "It was like all of a sudden I woke up," recalls the CEO of Sky Zone Indoor Trampoline Park.

Though only 24 at the time, Platt was exhausted. He'd been working 16-hour days, seven days a week, for two years since launching the Los Angeles-based company's second trampoline park, this one in St. Louis. He had taken no vacations, had no social life whatsoever. In the bootstrap tradition, he was doing it all in the early days of the venture started by his father, Rick. But that habit is sustainable only until the reality of mental and physical limits strikes.