Because it has been so uncomfortably cold the past few days, I decided to be cautious and do my tempo run indoors on a treadmill.
As usual while I was running I took note of some of the things that made running on the treadmill different than outside - some easier some harder.
The main thing I try to avoid is bounding. I try to keep my leg turnover per minute pretty consistent because when I bound I feel like I can cheat the system a bit.
But let me get to my main question. A huge difference between treadmill running and outdoor running I have seemed to overlook for a long time is that:
**** You do not have inertia when you are running on a treadmill *****
Please someone correct me if I if I am visualizing this incorrectly. It is kind of like the airplane taking off from a treadmill question except this isn't a trick question, and I THINK it actually has to do with the pushoff from the treadmill.
But in any case, I'm 6'0 160 lb runner. I consider myself a rhythm runner. I ran a 1:13 half marathon in the fall and I ran a 15:03 5k in college. I feel like I can roll at times, but I rely on inertia to run decently in distance events. I was never great on winding xc course because all of the changes in direction.
Likewise on the treadmill yesterday as I was getting under 6 min pace, i started to wonder why i never felt like I was rolling. Usually midway through my tempo i get that feeling that i am a machine rolling along. But on the treadmill I felt like my legs kept spinning faster and faster but there was no momentum built up.
This all seems accurate and pretty obvious but it was an interesting realization to myself. I haven't been in a physics class in a while though, so I was wondering if anyone would argue that I have the same inertia in the instant I propel myself forward after one push off on the treadmill as I do when I am moving on land. In that instant in the air am i going forward just as fast as I am on land? can that be considered momentum even though a second later that treadmill counters and I don't move forward? Does it just seem like i am not gaining momentum when in fact I am? I dont think so. It just doesnt seem like my body weight is behind me.
Any input would be greatly appreciated.