My reaction to this is similar to this one: http://norvig.com/21-days.html (Teach Yourself Programming in Ten Years) I've been exercising regularly for a long time and know pretty well what my "equilibrium" exercise time is, and it's about 5 - 6 times longer than 7 minutes. If I thought it could be shorter, then I would make it shorter because my #1 goal is to minimize the number of minutes of my life I spend on exer…
(Of course, you might get hit by a bus tomorrow, but that's true whether you exercise or not. I guess you should avoid exercising near traffic.)