Friends and clients wane lyrically about the 'zone' and the sheer delight of finding that rhythm and cadence of metronome precision.  The mere thought of running or 'jogging' has me thinking of sweaty eyes, flushed face and ankle shattering kms of tarmac.  Sometimes necessity indicates a challenge to your persona.  The need to conquer no matter how ambivalent you are towards the task -  so to the challenge I go, with fixed determination to try and conquer my fear and my resistance.   And every now and then you end up surprising yourself.