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What You Can Learn Watching 18 Heats of the 100m Dash

Blog| ByChris Korfist

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Sprinters Finish

We all know the meet. Four to six big teams show up together on an April Saturday afternoon for a no-limit entry track meet. The last heat is scoring, but the rest are non-scoring. Some people find a way to kill the 45 minutes of 100m dashes with their meal ticket or find another coach to talk to about the problems of post-COVID-19 coaching. While I eat during the three heats of the 3200 and reapply sunscreen during the five heats of the 1600, I like to plant myself midfield right next to the track and watch the 18 heats.

As I watch athletes project their mass down the track in various sprinting styles, I wonder what can be done to make the 12.5 into an 11.5.

I know there are basic things that can be done to start making progress down that road. Stuff that I have written about in the past: crossover feet, heel strikes too far in front of the body. And we know how to deal with these issues with mini-hurdle runs and stiff-legged runs (Paytons or Prime Times). But if it is halfway through the season, and the drills aren’t catching, maybe we should start looking at some other things.

Posture is the first thing that jumps out from the early heats of the 100. Something that is so basic that we forget to deal with it in practice, drills, or even weightlifting. Why does posture fall apart? When the system is red-lined, like in a full sprint, there is a hierarchy to movement.

After breathing and keeping a horizon (and few other things), not falling is important. Safety is far more important than speed. The body quickly assesses what muscles can support the movement. It will shift so the muscles used are the ones that can support the body safely. They are not always the most powerful or efficient but the safest. If you don’t think this is true, watch how fast posture and gait change when someone injures themselves while sprinting.

In a full sprint, not falling is important. The body quickly assesses what muscles can support the movement and shifts so the muscles used are the ones that can support the body safely, says @korfist. Share on X

Once we are safe, we will move toward our target. This is why different body parts sometimes move toward the finish line. We are throwing as much as we can at where we are going. This is the reason when you blindfold someone and have them sprint, their form changes. Or when a happy 3-year-old is sprinting for fun and running fast, they always seem to have good form. Form becomes more natural when we eliminate intent.

There are three sections of the spine:

  • Cervical
  • Thoracic
  • Lumbar

All three work together to counterbalance each other. The more an athlete can keep a neutral spine, the better the body performs. A good athlete can keep a neutral spine in various positions. A really good athlete has the ability to use their spine to create more power in their movement.

Where to Begin?

Let’s start in the middle. I know it is a strange place to start, but it is the place that controls both ends—really, it’s no different than an axle with two wheels on each side. The stiffer the middle, the more stable the ends will be. Same with a runner: if the middle is not stiff, both ends will compensate to get the body to the target.

Rib Control
Image 1. This probably the most common power leak I see in the torso. The runner lacks the abdominal strength to anchor the bottom of the rib cage in the gait cycle. The result is a rib that juts out. The consequences of that lack of control are a less stable upper and lower end.

In the case of the runner above, to gain extension, he loses pelvic control. As you can see, his right pelvis is over-rotating, which leaves his right leg long in the push. A telltale sign is that his right knee is behind his glute. This creates the problem of a longer time to swing the leg through, and the knee cannot get to the needed height for a good, fast tangential velocity.

Spin Rib
Image 2. This is a more extreme version of the issue in Image 1. The athlete uses excessive twist in his spine to create some torque to go faster.
Torque Sprint
Image 3. The runner on the right has much better mid-point control. His knee is still under his glute, even in full extension. There is no excessive torso twist.

Here are some effects of a wobbly middle. The first impact is the head.

Head Tilt
Image 4. These show the extended rib cage. The end result in both is that the runners’ heads have fallen back.

If the body follows the head, the net propulsive forces are reduced with the 12-pound weight falling backward. If a coach asks the athlete to stand in place with the same head position, they will fall back.

Wobbly Heads
Image 5. Here are some other examples of wobbly heads. The first place runner creates tension in his system by sticking out his jaw. If he can keep his horizon level, his body feels more comfortable and will allow more power. And his 12-pound weight is leading the way. But his hips fall behind and cannot generate any tangential velocity on his run and will “push” his run.

Below are examples of what happens of what happens on the pelvic end of the axle.

Pelvic Drop
Image 6. The far runner has lost control of his pelvis due to the rib pop. The is usually the runner who runs out of gas at the end of the race, mostly because he has wasted all of his energy repositioning his hips throughout the race. As he fatigues, he tries harder, which only makes the problem worse as he pushes further back. A great cue for this runner is quick feet at the end of the race.
Ab Control Loss
Image 7. The runner in the orange and white is another example of pelvic control. By pushing his chest out, it takes some of the weight off the pelvis and allows for some forward momentum. Sometimes, these are the ones who fall at the finish line. 
Good Pelvis
Image 8. Here are two useful pics of good pelvic control. Hips stay level the entire time—the net result of this is the ability to place the foot in a position to generate tangential velocity.

Why Does This Happen? We Do Core Every Day!

You may be using the core exercises, but not properly. How often do you see people doing planks and dropping their head or pelvis? How often do you see side planks with the chin sticking out to balance or the spine not neutral in three planes?

Once you have a base of spinal control and strength, try challenging the spine with movement. Ask the spine to control itself in unpredictable scenarios, says @korfist. Share on X

When doing any of your running drills, how often do you focus on posture? Once you have a base of spinal control and strength, try challenging the spine with movement. Ask the spine to control itself in unpredictable scenarios. Enter the water bag. Try your drill and sprints with a water bag on your back. The spine has to constantly adjust.

For more advanced drills, I will be presenting at the University of Minnesota with Dan Fichter and Cal Dietz in July and will cover postural progression in detail. You can find sign-up details for the clinic here.

Since you’re here…
…we have a small favor to ask. More people are reading SimpliFaster than ever, and each week we bring you compelling content from coaches, sport scientists, and physiotherapists who are devoted to building better athletes. Please take a moment to share the articles on social media, engage the authors with questions and comments below, and link to articles when appropriate if you have a blog or participate on forums of related topics. — SF


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Chris Korfist

Chris Korfist has been a high school coach in track and football for almost 30 years, with more than 80 All-State athletes. He has also been a strength coach at the college and high school levels, working with many sports. Korfist owns a private facility called Slow Guy Speed School that helps develop athletes ranging from World Champion to middle school. He has consulted with professional sports teams all over the world, including the NFL, MLB, NBA, and Rugby League.

Korfist has published research on sprint training and is an advisor for Auckland University of Technology’s SPRINZ. Additionally, he co-owns Track Football Consortium (@TFConsortium), is co-founder of Reflexive Performance Reset, and has discussed training in countless blogs and podcasts.

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