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"I was wondering if all reasons for the body indicating the need to stop or pause during such 'go for as long as you can' physical activity could be put down to a very short list? Other than these two being the element which needs a stop first the only other things I can think of that might be the cause are fueling, either dehydration or no calories/energy to burn, or a simple mental will not to continue (for whatever reason).
"...or physical injury, such as a sprained ankle, which i am not overly interested in for the purposes of this inquiry into which 'departments' of the body might 'go' first.
"I am hoping that there is some insight here to add to our further skill of knowing, understanding and listening to the body. Not for the purposes of high endurance events, per se, but just as an insight.
"As I say, for me, this was something I became aware of just seeing if I could do a two mile jog round the block whilst I was getting fit."
Reply:
"Hi James,
"A common confusion. But let's start at the beginning. It isn't lungs v muscles. Wrong concept. They are part of the same beautiful system and are totally synergistic.
"But to your situation: yes, it probably started out as shortage of breath before muscle fatigue. Then as you get fitter your heart and lungs (the cardio vascular system) can cope better with the demands made on them, and as you rightly say it is then the muscles that determine the length of the session.