I don't really disagree with your points, but I think you are still arguing something slightly different than the original statement. The original supporting points make it obvious that efficiency is referring the the whole of the exercise routine, not just the portion spent exerting yourself. A sport based activity may be a better workout, but you generally don't start that workout as soon as you step out your door.
> If pure cardio is what you want, jumping rope is more efficient.
I imagine it is. I suspect getting the majority of your exercise doing something the human body has evolved to be extremely efficient at is not the most efficient use of the time, depending on your goal. I think one of the major benefits of running (even though I hate doing it) is its convenience (which sort of ties into how efficiency was being used previously).
> If pure cardio is what you want, jumping rope is more efficient.
I imagine it is. I suspect getting the majority of your exercise doing something the human body has evolved to be extremely efficient at is not the most efficient use of the time, depending on your goal. I think one of the major benefits of running (even though I hate doing it) is its convenience (which sort of ties into how efficiency was being used previously).