A
recovery run is a run
that simply allows waste products from previous
sessions to be flushed out of an athlete's system.
This isn’t very scientific, but basically when
you hear someone refer to a recovery run it just
means a short slow run to get rid of some of
the stiffness that may have accumulated in your
muscles.
This is a device most commonly used by distance
runners, particularly those who are in a period
of hard training (recovery runs may be done the
morning after tough sessions).
Sometimes long distance runners, in particular,
find it useful to jog in between hard runs in
an interval session in order to keep moving and
so avoid having muscles stiffen up.
This kind of jog could almost be done on the
spot and is not part of the whole session and
should not be confused with fartlek training.