Yacov Wrocherinsky, CEO of Infinity Info Systems Corp., and 47 other executives paid more than $5,000 each to endure a grueling training course at the hands of former Navy SEALS. Wrocherinsky says that after four days of no sleep and constant physical challenges, he had a surprising reserve of energy. "They emphasized leadership principles we could use," he says. "They thrive on chaos. When everybody's confused, they know what to do."