For
years,
the
venerable
long
run
was
the
single
most
important
staple
of
any
marathon
training
program.
The
physiological
benefits
are
well
documented,
but
there
is
the
added
psychological
benefit
which
comes
from
asking
your
body
to
accomplish
something
it
may
never
have
done
before.
The
idea
of
completing
your
first
20-miler
brings
with
it
much
apprehension,
but
also
much
...
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