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In this video we're going to run through the first stages of a video analysis, looking
at a particular running action and highlighting points of interest.
So the first thing we'll look at on this particular video is the lean of the body and the crossing
of the feet. On the rear view, if you look at the line of crosses, blue for the right
foot and red for the left foot, you'll see they're on the wrong side of the black line
of movement. That's giving a lateral force on the foot as it lands, which fortunately
the shoe is handling. Turning your attention to the athlete's head
and shoulders, and using the cross-hairs for reference, you can see that the trunk is swinging
to the left and to the right he runs. So taking the body as a whole, landing on the left leg,
the whole body is angled to the left, and landing on the right leg, it's angled to the
right. Now we'll have a closer look at the line of
drive for each leg. On the rear view, as the athlete takes off with his left leg, you can
see that he's actually driving outwards, to the left of the line of movement. Once he
has taken off with his left leg, you'll see that the leg continues to swing across behind
him. Correspondingly, on the front view, you'll notice that when the left leg drives, the
right leg swings across the front of the body. This pattern is much more pronounced for the
left leg than it is for the right leg. Next we'll have a look at how the hips move
as the athlete runs. On the rear view, watch the horizontal movement of the belt when each
the leg drives off. You'll see that the hips are rotating or 'giving' slightly on each
drive. On the side view, if you look at the belt and the hip markers, you can see how
the hip tilts and moves forwards as the nearside leg drives. This contrasts to them moving
upwards when the opposite leg drives. Finally, we'll take a look at the general
posture of the runner. On the side view, you may have already noticed how the trunk leans
forwards, although the upper back tends to straighten up when a leg drives off. The hips,
too, are generally tilted forwards. The knee drive is not particularly high, and the foot
swing is from high behind to low in front. Drawing these threads together, there may
be several different points to follow up, or they might be related. The side-to-side
lean of the runner may arise because of the outwards drive of the leg. The drive of the
leg may be associated with the rotation in the hips. The failure to control the horizontal
rotation in the hips may have the same cause as the forwards tilt both of the hips and
the trunk in general. And this forwards lean may be related to the low knee action and
to the foot swing. We'll stop here, but in later posts we'll
try to isolate the different issues and study them in a systematic manner.