I can easily run in place at a fair pace for literally hours after calves have been conditioned, burning well over 1,000 calories. I have thought this would roll over into distance running at the same pace, but it doesn't.
Even if I run the exact same speed or a lower speed with movement (and not in place):
1.I tire much easier (though I've lost physical conditioning due to depression, but remain able to run in place endlessly and seemingly never get tired).
2.I can lower my running pace, but still get tired and can't breathe correctly through my mouth (and nose is constantly stuffed and problematic due to sinusitis and congenital shape defomration).
3.None of the above applies anywhere near the same when running in place. For example, I could run in pace as fast as possible, and would hold up breathing well and get an amazing cardio session in -- but trying a slower, jog-ish kind of run murders me after a good 5-10 minutes.
This is the biggest problem I've had in trying to run a proper 5K prior to my depression.
Why can I run in place and not get tired much, even if super intense, but tire running with moving?