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"I'm a big believer in stretch goals—you have to push yourself way outside your comfort zone," says former Navy SEAL and Leadership Under Fire instructor Rob Roy. "If a person does 50 push-ups, we know he can do more." When benchmarking for success at your company, don't be afraid to set high goals for your employees

Harvard Business School Taught by: Noam Wasserman Most entrepreneurship classes chase the strategy-innovation-finance trifecta. But people problems cause more than 60 percent of new-venture failures, research shows.