Are you “balled-and-chained” to  your computer and wonder why your long runs are bad and your shoulders hurt all the time… well it could be your job and the way your are hunch over your work station.. This is what I suggest you can do  “in-between your  long runs.”..   I strongly suggest some sprint days.  Maybe some fast 400 meters.   Then another day some uphill running. Also need to do some agility work.  For a start…..

If you really appreciates running long , that long-distance auto-pilot cruise-control activity will actually perpetuate the bad posture you have from your work station , whereas when we sprint, run fast, do intervals and things like that, we posture right up. We pull those shoulders back.

After these kind of between-run days,  you will enjoy the distance days even more.

Or Hey!!! maybe  jump rope or at least equal jump rope to running, simply because jump rope does not feed into a rounded posture, whereas jogging sometimes does.  As Always it is your choice …