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Tag: physics of parkour

Parkour WOD: 07/16/12 (landings)

by on Jul.16, 2012, under Parkour WOD

Parkour WOD 5

What are we training?: Landings.

This will not be a WOD to practice safety rolls, but one to practice landing at the end of a jump or precision. This should be how you land from most level movements, i.e. not from a height. You should ALWAYS roll when jumping or falling from any height greater than your shoulder.

How can you practice it?:

Landings are all about progression. You cannot start running and jumping off things without proper landing mechanics and without building up your muscle and tendon strength in your legs, ankles and feet. If you cannot perform 50 body-weight squats in a row without stopping, and without perfect form, you should not be landing from anything higher than 2 feet.

A parkour landing should begin at the jumping/precisioning point. Always make sure that you are landing in a safe area. Know what type of material you are jumping from and landing on (e.g. landing on slippery materials requires you to land perpendicularly to the ground so as not to slip forward or back). Also, you will always jump from your take-off point. Don’t just fall, even if you are at a height. I almost ruined my money-maker when I fell face-first off a wall when I just kind of fell and my toes clipped a recessed stone lip. Clear your feet from any obstacle at the beginning of the movement by getting some altitude.

As you leave your feet you should bring your knees up in front of you.

The reasoning for this is several-fold: 1) You will increase the height and distance of your jump by not leaving your feet behind you; 2) you will be able to pick your landing point and place your feet with more accuracy (if you jump with your feet trailing behind you, there is an increased chance of missing your precision point); and 3) you are in perfect position to absorb your landing with your legs.

When you are at the height of your jump or fall you need to extend your legs out underneath you.

You are not locking your knees, but keeping them slightly bent. You are almost reaching for the ground with your feet. You land on the balls of your feet and absorb the impact by going into a squat. You actively resist the fall by pushing against the ground as you come to a stop.

You do NOT land on your heels. You have a very large bone in your heel (the calcaneus) and it will hurt like a mother if you land directly on it. If you are practicing landing and it hurts you are doing it wrong. Stop what you’re doing and look at the movement again. Take this slow. You do not want to blow out your knees.

You do NOT keep your legs super loose and let your momentum take you all the way to the ground. Some people are super flexible and just collapse into themselves. Don’t do this. Use your quads and hamstrings to slow down the landing as you fall.

Why is this important?

Safety. Parkour is an incredible activity that can change your mental paradigm and how you look at the world. There are few things as satisfying as hitting a parkour movement for the first time. The other side of this coin is that parkour is dangerous. You can seriously hurt yourself doing the smallest movements if you do not pay attention to your surroundings or perform the movement properly. You need to be able to land properly and without hurting yourself.

Now, why is this landing safer and better for traceurs? Let’s do some physics.

The purpose of the parkour landing is to decrease the amount of force being applied to your body. Force is bad, mmmkay? Too much force puts unneeded stress on the body and its joints and bones which can result in injury and/or discomfort. Force can be described as:

F = m * a

m = mass and a = acceleration.

Further, acceleration can be described as:

a = (delta)Velocity/time

(delta)Velocity is the change in speed.

Hopefully our m is constant (if not you should probably go to the doctor, stop accelerating at near light speed), so the parkour landing is effectively reducing the force on our bodies by decreasing our acceleration.

Acceleration is decreased primarily via the extension of the legs. This gives the body a larger distance to travel prior to the ultimate stopping point (when movement is completed), and it also allows the traceur more time to slow his or her momentum going into the ground (by resisting the fall with your legs).

Another way to think about this is to imagine you are jumping from something and you land with your legs straight and/or locked. The impact is jarring because you come to a very quick stop, i.e. acceleration is very high as your speed changed very quickly over a short period of time.

By landing with your feet extended and then continuing the fall through that initial contact with the ground, you are extending the amount of time to complete the movement while also experiencing a decreased change in velocity. With ?Velocity being smaller and time being larger, acceleration has decreased, thereby resulting in less Force being applied to your body.

One tip that really helps with landing and reducing the force of the landing is to land with “ninja feet”. If you can land without making any sound then you are distributing the force adequately and safely.

The WOD:

Warm Up:

3 rounds of 10 push ups, 10 sit ups and 10 air squats

WOD:

etudiant

On the minute, for 10 minutes, perform an increasing number of broad jumps. In your first minute, perform 1 broad jump, in the second minute perform 2 broad jumps, etc. After you have performed the required number of broad jumps rest for the remaining time in the minute.

avancee

On the minute, for 15 minutes, perform an increasing number of broad jumps. In your first minute, perform 1 broad jump, in the second minute perform 2 broad jumps, etc. After you have performed the required number of broad jumps rest for the remaining time in the minute.

traceur

On the minute, for 20 minutes, perform an increasing number of broad jumps. In your first minute, perform 1 broad jump, in the second minute perform 2 broad jumps, etc. After you have performed the required number of broad jumps rest for the remaining time in the minute.

Cool Down:

All levels:

Read this ZombieFit Post on Ankle Conditioning

Perform 100 calf raises (50 each leg) x 2
Perform 100 toe raises (50 each leg) x 2

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Parkour WOD: 07/01/12

by on Jul.01, 2012, under Parkour WOD

Parkour WOD 3

What are we training?: Safety Rolls!

The safety roll or “parkour” roll is another essential skill that must be mastered prior to performance of any intermediate or advanced parkour movement. You should practice this rolls so that the movement is natural and instinctive. You will never know when you will need to roll out of a failed vault or precision and often you will not have time to think about rolling. This is the most important parkour movement you will learn.

How can you practice it?:

You can watch this video for a simple progression into teaching yourself to roll. Some keys to remember:

Practice on a soft surface when first starting to learn the movement.

If at ANY time the movement hurts anywhere you are doing it wrong.

Do not rush this movement, take your time and learn the skill. The parkour roll can and will (if you train long enough) save you from severe injury.

Why is this important?

Again, safety. When performing movements at full-speed or from any height you may find yourself heading towards the ground quickly and without having enough time or ability to absorb your landing appropriately. At that point you will do a roll and essentially take your momentum forward instead of into the ground, thereby distributing the force of the landing/bail across your entire body; instead of just on your legs.

We also can use the same physics to demonstrate the utility of a parkour safety roll as we did in the last Parkour WOD. By performing the roll you essentially increase the time of the landing while decreasing your change in velocity, thereby reducing the total acceleration of the fall/bail. As with the parkour landings, this decrease in acceleration lessens the total force of the fall/landing and results in less stress on your body.

The WOD:

Warm Up:

3 rounds of 10 push ups, 10 sit ups and parkour squats

etudiant

Roll Progression in the above video. Practice the movement until you are able to roll without pain and smoothly from your feet. Once you have achieved this expertise perform an additional 50 rolls.

avancee

50 safety rolls from the ground level.

25 safety rolls from a slight fall (2-4 feet in height). Make sure you jump from your take-off point and get some extra height. You will do the exact same thing as in the last Parkour WOD except at your landing you will go into your parkour roll rather than absorbing the impact with your legs. Practice the progression and take your momentum parallel to the ground instead of perpendicular.

25 safety rolls from the end of a vault (kong, speed, dash).

traceur

Same as avancee, however you should be performing the first set of 25 rolls out of a drop of at least your shoulder height. DO NOT ATTEMPT THIS UNLESS YOU HAVE COMPLETE KNOWLEDGE OF THIS MOVEMENT.

The second set of 25 should also be at the end of a vault, however you should attempt the roll with another movement after it, e.g. kong-roll-speed.

Note: These WODs are NOT for time. Learn the movement to the best of your ability.

Conditioning:

All levels:

For time, perform 3 rounds of:

20 sit-ups
20 push-ups
20 air-squats
20 pull-ups (may sub with jumping pull-ups)

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Parkour WOD: 06/26/12

by on Jun.26, 2012, under Parkour WOD

Parkour WOD 2

What are we training?: Landings.

This will not be a WOD to practice safety rolls, but one to practice landing at the end of a jump or precision. This should be how you land from most level movements, i.e. not from a height. You should ALWAYS roll when jumping or falling from any height greater than your shoulder.

How can you practice it?:

Landings are all about progression. You cannot start running and jumping off things without proper landing mechanics and without building up your muscle and tendon strength in your legs, ankles and feet. If you cannot perform 50 body-weight squats in a row without stopping, and without perfect form, you should not be landing from anything higher than 2 feet.

A parkour landing should begin at the jumping/precisioning point. Always make sure that you are landing in a safe area. Know what type of material you are jumping from and landing on (e.g. landing on slippery materials requires you to land perpendicularly to the ground so as not to slip forward or back). Also, you will always jump from your take-off point. Don’t just fall, even if you are at a height. I almost ruined my money-maker when I fell face-first off a wall when I just kind of fell and my toes clipped a recessed stone lip. Clear your feet from any obstacle at the beginning of the movement by getting some altitude.

As you leave your feet you should bring your knees up in front of you.

The reasoning for this is several-fold: 1) You will increase the height and distance of your jump by not leaving your feet behind you; 2) you will be able to pick your landing point and place your feet with more accuracy (if you jump with your feet trailing behind you, there is an increased chance of missing your precision point); and 3) you are in perfect position to absorb your landing with your legs.

When you are at the height of your jump or fall you need to extend your legs out underneath you.

You are not locking your knees, but keeping them slightly bent. You are almost reaching for the ground with your feet. You land on the balls of your feet and absorb the impact by going into a squat. You actively resist the fall by pushing against the ground as you come to a stop.

You do NOT land on your heels. You have a very large bone in your heel (the calcaneus) and it will hurt like a mother if you land directly on it. If you are practicing landing and it hurts you are doing it wrong. Stop what you’re doing and look at the movement again. Take this slow. You do not want to blow out your knees.

You do NOT keep your legs super loose and let your momentum take you all the way to the ground. Some people are super flexible and just collapse into themselves. Don’t do this. Use your quads and hamstrings to slow down the landing as you fall.

Why is this important?

Safety. Parkour is an incredible activity that can change your mental paradigm and how you look at the world. There are few things as satisfying as hitting a parkour movement for the first time. The other side of this coin is that parkour is dangerous. You can seriously hurt yourself doing the smallest movements if you do not pay attention to your surroundings or perform the movement properly. You need to be able to land properly and without hurting yourself.

Now, why is this landing safer and better for traceurs? Let’s do some physics.

The purpose of the parkour landing is to decrease the amount of force being applied to your body. Force is bad, mmmkay? Too much force puts unneeded stress on the body and its joints and bones which can result in injury and/or discomfort. Force can be described as:

F = m * a

m = mass and a = acceleration.

Further, acceleration can be described as:

a = (delta)Velocity/time

(delta)Velocity is the change in speed.

Hopefully our m is constant (if not you should probably go to the doctor, stop accelerating at near light speed), so the parkour landing is effectively reducing the force on our bodies by decreasing our acceleration.

Acceleration is decreased primarily via the extension of the legs. This gives the body a larger distance to travel prior to the ultimate stopping point (when movement is completed), and it also allows the traceur more time to slow his or her momentum going into the ground (by resisting the fall with your legs).

Another way to think about this is to imagine you are jumping from something and you land with your legs straight and/or locked. The impact is jarring because you come to a very quick stop, i.e. acceleration is very high as your speed changed very quickly over a short period of time.

By landing with your feet extended and then continuing the fall through that initial contact with the ground, you are extending the amount of time to complete the movement while also experiencing a decreased change in velocity. With ?Velocity being smaller and time being larger, acceleration has decreased, thereby resulting in less Force being applied to your body.

One tip that really helps with landing and reducing the force of the landing is to land with “ninja feet”. If you can land without making any sound then you are distributing the force adequately and safely.

The WOD:

Warm Up:

3 rounds of 10 push ups, 10 sit ups and 10 air squats

etudiant

3 rounds of*:

10 parkour squats
10 push ups

avancee

5 rounds of*:

10 parkour landings
10 push ups

Pick a height you are comfortable with, but nothing more than 4 feet. Stairs are an excellent tool for training this movement as you can start at step 1, then move up steps as you become more familiar with landing. DO NOT RUSH THIS MOVEMENT. Make sure you are performing the movement appropriately. Again, there should be no pain if you are performing this movement correctly. If you believe you are doing everything right and it still hurts, then you are jumping from too high of a height, you will need to shorten the height and/or start rolling.

traceur

3 rounds of*:

20 parkour landings
20 push ups

Same proscriptions as listed above for the avancee WOD. Be safe!

**These WODs are NOT for time. Concentrate on the movement and making sure that you are performing it correctly.

Conditioning:

All levels:

Read this ZombieFit Post on Ankle Conditioning

Perform 100 calf raises x 2
Perform 100 toe raises (conditioning your anterior tibialis) x 2

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