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Posture
Don't try to be a Marine at attention. The best posture
for running, walking or cruising is just good posture, with
all elements relaxed and balanced as the foot comes underneath.
A forward lean forces you to shorten your stride and creates
extra tension on the lower back and neck. A backward lean
is unusual but will also produce a shorter stride and possible
tension in the lower back.
Some will argue that a forward lean will help you run faster,
but I've found this to help only for a hundred meters or
so. It forces you to work harder and therefore spend resources
that are then not available later in the run and you lose
more time than you gained during the short burst. The only
exception I've found to this rule is when running on a gradual,
downhill grade. A slight forward lean can help you run faster,
and the boost from downhill gravity will offset the decrease
in stride length.
Bounce
When in doubt, use less energy and
stay lower to the ground, and you'll run faster, more smoothly,
and with better leg turnover. The energy spent in bouncing
too high even by an inch is wasted - burned up in the air.
The higher you lift yourself off the ground, the greater
the shock you have to absorb when landing and the longer
it'll take for your feet and legs to recover from that run.
Excess bounce also forces the legs to go through inefficient,
extraneous motion during the extra time in the air. A higher
back kick, for example, is the result of excess leg swing
because your body is off the ground for an extra second
or so. Such a kick produces early fatigue in the hamstring
muscles.
You can correct bound by keeping
your feet close to the ground during sections of every run,
especially when you feel the temptation to bounce, which
is usually during the first mile and when going downhill.
Instead of bouncing and spending energy, save your resources
with a quick and light lift-off of the foot. You'll run
about as fast by staying low to the ground and taking more
steps per minutes.
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