Philadelphia-based insurer Cigna Corp. has closed a deal to spend up to $5 million to buy Kronos Optimal Health Co. Kronos currently contracts with 13,000 health coaches around the United States who can counsel on weight loss, stress reduction, fitness, and diet, all part of the growing trend toward "wellness" at work, the Philadelphia Inquirer reports. Cigna representatives said that giving Kronos access to Cigna's larger customer base would move it into profitability while providing a necessary enhancement for Cigna's existing customers.