Sprint speed is the product of stride length and leg speed (cadence). How you train to improve these qualities is vital for increasing your speed. So, what’s better? Training for stride length or leg speed when it comes to maximising sprint speed? Oh, and how did a certain Mr Bolt do it?

The Perfect Tool

First things first though Muscle Runners are the perfect tool for improving sprint speed, no matter what your level or sport. These "fast" shoes are specifically designed to do the job. Here’s an example why.

Antepes Muscle Runners have a Dual-Flex Carbon Fiber Plate which is carefully crafted and positioned to be more flexible in the forefoot and more rigid under the arch and heel. The thought process behind this was to create a controlled “bow” in the shoes on foot-strike. This optimally “whips” your foot into and out of the ground contact. Sport scientists call this the “spring function”.

Stride length

The “perfect sprint” stride is neither too long (coaches call this over striding”) nor too short (“under-striding”). The optimum stride length is dependent on your sprint technique, how much power you can put into the ground, and physical qualities – such as the amount of speed producing fast twitch muscle fibre you have and something known as leg stiffness, of which more later.

Cadence

Most elite sprinters can move their legs 4-5 times every second – that’s to say complete 4-5 strides. If you focus on an elite, you’ll see the blur that this rapid leg cycle creates and the distance covered.

Interestingly at sub-elite level turnover is not much different (nor is it with increasing age - here it's stride length which suffers). It’s the force which is put into the ground coupled with optimum stride length which makes for the velocity difference.

Work too much on leg speed and there’s potential that stride length will decrease – this can be good if you were previously over striding or had a slower than average cadence. However, it’s not so good if you had an optimum stride length. Consider that you will cover more ground with an optimised stride length compared to one which is too short.

This is what made Usain Bolt so great. He had a huge, optimised stride length with more or less the same turnover at maximum velocity as his rivals. So, Bolt would be eating up the ground.

This is what made Usain Bolt so great. He had a huge, optimised stride length with more or less the same turnover at maximum velocity as his rivals. So, Bolt would be eating up the ground.

Research (1) indicates that Bolt took 41 steps to run his 100m world record which was around 4 less than his rivals. Bolt’s longest stride length was 2.872m between 60m-70m in the race.

For reference the average of his leg speed was 4.47 stride per second (sports scientists measure this in Hz).

Just for the record the leg speed capabilities of men and women hardly vary. Men run faster as they have more power.

In the research which looked at Bolt’s world record run there is a very telling reference – it being reported that:

“… 90% of a runner’s velocity is attributed to stride length, and anything after that increases through frequency.”

So, improving stride length using your built-for-speed Muscle Runners should be your priority.

As indicated, this is dependent on many factors. However, the great news is that with the right training you can optimise your stride length. In this post we'll look further into increasing leg stiffness - one such method. Do look out for other posts and the follow-up to this one which look more into this and considers other relevant factors.

Stiffness improves stride length

Another piece of research (2) looked at how well-trained male athletes improved their sprint speed over 6 months of specific training. Cutting to the chase it was discovered that maximum sprint speed was developed through:

“…. longer step length accompanied by increases in vertical and ankle joint stiffness…”

In short, the specific training of joint stiffness meant that more power could be extracted from the running surface. If the soft tissue of the legs (muscles, ligaments and tendons and even fascia) can create a "harder" and quicker block and subsequently enhanced return of force on ground contact then sprint speed will be increased.

Stride length increasing drills

1: Speed bounds

From a standing start leap forward by swinging one thigh away from you. When the thigh is near parallel to the ground, drive its foot back into the ground to strike it on the forefoot of your Muscle Runners. Immediately swing the other thigh forward and strike powerfully down into the ground again. Use a powerful arm drive to support the leg movements. At the start as you accelerate you can incline your body forwards as you would when sprint accelerating. The length of the bounds will increase as you beat inertia.

As you move away from the start get your torso more upright. Basically it’s succession of:

“Swing thigh to parallel very fast”

“Stamp down (drive) into ground from an elevated thigh position back under hips”

The idea is to drive/push your body forwards. Think of speed bounds as "stiff legged sprinting". There is little cyclical inclusion.

Do: 3-4 x 20m

2: Drop jumps

Drop jumps are great for developing leg stiffness. Use a sturdy platform. Its hight can vary between 30cm-90cm. Step off and minimise knee bend when landing on two feet. Contact the ground on the forefoot of your Antepes.

Focus on this minimal knee bend as you react to the contact as fast as you can as you jump up. Don't focus on height as this will slow your reaction.

Try to triple extend through the ankles, knees and hips. To reiterate get off the ground as fast as you can. Swing your arms to assist you.

Do: 3-4 x 6 from varied hights

Consider the speed of your reaction against the height of the drop, if you feel it is too slow then use a lower drop.

Another way to consider this is to monitor how much you bend your knees on ground contact, if it is more than a few degrees and you are lowering (yielding too much to the force) then this indicates the drop is too great.

In part 2 of this post, we will look more into how you can improve stride length and leg speed as well as considering leg stiffness some more and fast twitch muscle fibre.

References

1: Multicomponent Velocity Measurement for Linear Sprinting: Usain Bolt’s 100 m World-Record Analysis

Bioengineering (Basel). 2023 Nov; 10(11): 1254. 

Published online 2023 Oct 26. doi: 10.3390/bioengineering10111254

2: Development of maximal speed sprinting performance with changes in vertical, leg and joint stiffness

J Sports Med Phys Fitness. 2017 Dec;57(12):1572-1578.doi: 10.23736/S0022-4707.16.06622-6. Epub 2016 Jul 13.

 

 

 

 

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Scott Beatson
Muscle Runners & Fascia Crusher

I recently purchased these two items after many years of sprinting. I have finally found the perfect training partner, when not wearing spikes. Not only are the muscle runners the Closest runners you can get to spikes, followed up with the Sue crusher. They are the perfect compliment for a sprinter. Well done guys excellent product.

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Peyton Caldwell
Great training show!!

These shoes were everything as advertised!! So far they are best training shoes I have bought!! They feel amazing on my feet and my legs feel great after working out!! WILL DEFINITELY buy them again

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Marvin Tasby
Awesome Shoes

I really love how they have me run on the balls of my feet.

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Richard Gittens
Brilliant first training session wearing these shoes.

This review is from my very first training session last week wearing these shoes. I will be able to give a proper review in a few months time. Basically the shoes felt brilliant whilst putting them on. Lovely and snug with a true to size fitting. Didn't take me long to run as the shoes force you to. Did a great speed session and was amazed how fast I was running. This was followed by a plyometrics session. I was able to perform repetitive bounds with excellent technique. So far I'm loving the shoes. Although the athletics season only has a couple of months left, I’m sure I can improve my performance within this time. These shoes will be used in all of my winter training sessions (speed work, hills, and plyometrics), and I'm confident my performance in the triple jump will improve due to a better running technique in the 2025 season.

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Marco Giavoni
Awesome shoes!!!

Tried them a couple of times, they definitely do what they promised!! They push to run forefoot, they makes calves working more, and they make you fly faster than any other running shoes!!! I LOVE THEM, and I’m going to get another pair, as spare shoes!