The swing from end to end

I don't know if this is real or perceived.  I discovered this after I conked at the NB real run.  There is a 10k arm swing, and an arm swing for a relaxed run. 

Forever the tinkerer, up till some 2 months ago, I have been experimenting with a changed arm swing.  This is where I envisage my arms are dislocated from my shoulder and swing free-ly.  My arms do not swing across my body but are turned in slight; nonetheless, they swing beside me and in a forward motion.  The legs naturally coordinate and I find I run faster this way.  It feels faster and it is faster because every hill workout remains tough.  This arm swing got me my PR at the Nike City run recently, when I did not think my fitness level would be up to the mark.

During the NB run, I held my arms slightly higher, and slightly more inclined inwards.  I still envisage my arms being dislocated from my shoulders though.  And with this, I seemed to go at an easier pace, with smaller stride lengths.  I tried this last night and came away fresh; the best I have felt on a run in recent times.

I just read something to augment the slow pace arm swing - focus on moving the elbows backwards because the arms swing is all about a back swing.  I'll give this a try when I do the Bedok Reservoir route tonight.