It is very important when
you a doing a running schedule that it is carefully
thought out either by you, or by someone who is
helping you.
This may sound surprising, but one
of the most common problems runners face is
training too hard. This can lead to fatigue and
lack of recovery, which ultimately will cause
injury or illness.
Particularly if you are
relatively new to running, be cautious - start
slowly and over shortish distances. You can
always increase the intensity over time (not
something you can do if you face a lengthy lay
off from having trained too hard).
From experience, the athlete that manages to
run at a consistent manageable level all year,
will normally perform better than the one who
trains very hard for 6 months of the year, but
spends the other 6 months having to recover from
injury problems.