Another company is piloting a four-day workweek, and it could make a shortened week the norm within Corporate America. Exos is a coaching company that trains pro athletes and runs corporate wellness programs at 25% of the Fortune 100, including Intel, Capital One and Humana. One clear rule: You can't message other people or try to set up meetings for Fridays, Robb O'Hagan says. Exos, a coaching company that trains pro athletes and runs corporate wellness programs, will pilot a 4-day workweek in May. "At the end of the six months, we're committed to continuing with the four-day workweek unless there's such extreme negative results that we'd choose otherwise."

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