Ok, but if you plan to do something(not just excercise) regularly, maybe it is better not to calculate with the initial costs/benefits but with the long term av

Ok, but if you plan to do something(not just excercise) regularly, maybe it is better not to calculate with the initial costs/benefits but with the long term averages... There are plenty of activities in life that initially only have costs and zero benfits - excercise at least consumes calories from day 1...