More than 26 percent of U.S. adults report that in the past 30 days, the only activity they got was whatever was required to do their job. There are a lot of sit-and-stare-at-a-computer-screen jobs and working from home has slashed the notion of motion even more. Only about one in four of you even gets the still-official minimum of 150 minutes of activity a week. Pssst, We think 300 minutes weekly…