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Trajectory planning for foot placement.


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I just did a quick search, so I don't claim to be an expert. The two main methods seem to be thead/tfoot and position:fixed. I didn't mean to imply that this are smarter/better, but they might be easier in certain conditions.

Where do I put my feet?

I also like them for feet placement. They just aren't faster from my experience. It was not something I expected.

Hard disagree on that. The image of aligning your toes with a starting line is what makes sense. By contrast, while you may use a line to pull something behind you, it's never the line itself that you're towing.

If you judge distances well you can still pop your foot. The deceleration curve is optimized to be smooth (minimize jerk?).

Keep your downward-projected center of mass inside the convex hull described by your feet.

Move with your feet

>Foot Retention System

Put one foot in front of the other.

Left foot, right foot. Repeat.

USE A FOOT PEDAL.

USE A FOOT PEDAL.

It is also important to intelligently select where your vertical leg is placed.

maybe a smaller contact point means a simpler model that doesn't have to take the orientation of a larger foot into account?

The way to get to the proper technique is to continually reduce stress and energy waste.

For example, you start off landing heel first, and realize that when you do that, you can't effectively soften the landing and your heel hurts. So you land on the ball of your big toe. This allows the entire foot-ankle system to act as the initial shock absorber.

After that you realize the ball of your big toe might start hurting, so you adjust your foot so that you land with even pressure across the balls of all toes.

Then you learn to land with knees a little more bent.

Then you learn to reduce unnecessary vertical energy transfer.

Then you learn to balance your upper body in the proper position ...and so on until you can't figure out a way to reduce stress or energy waste any further.

If you've optimized for stress reduction and energy, you'll have nailed the perfect form for your given joint and muscle structure.

I broke my right ankle pretty badly (not from running) many years ago, and for that reason the positioning of my right foot when I land is slightly different than for my left foot. This is because the joint structure is different between both ankles.


Which feet?

While an ideal spring may not exist, the foot itself might be the next best thing suited to that goal. It’s full of nerves that allow the brain to make micro adjustments, as well as muscles for executing those compensations in real time, based on feedback thats coming from the ground.

The correct solution: foot pedals, as used in hospitals. Avoids contact-spread infections.

>Roll the feet: First place the centre of the heel, then roll the outside edge of the foot down before placing the outer toes, and rolling down the inner toes.

Do we know if this is better? I mostly wear barefoot/minimalist shoes and have switched to mid/forefoot strike, from a heel strike.

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