A recent article - Two hours of sitting cancels out 20 minutes of exercise, study finds
I am calling BS on the study based on the math in the title. In college my longest practice was an hour and twenty minutes, sometimes an hour and a half. My coach was of the opinion that that was how long a basketball game was and to go longer would only result in pacing.
There was little down time; we ran like the wind. We were almost tireless. I was in the best shape of my life. I also had long hours sitting in the classroom, library, and in front of the TV – much more sitting than the four hours it would take to cancel out the gains derived from exercise.