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I'll have to remember to skip while jaywalking

It's becoming possible to accurately estimate anthropometry from any footage of a person moving, so this still identifies you.

Would putting like rocks or small tacks in my shoes be enough to throw this off?

No, because estimating anthropometry is not gait analysis. It's about working out the relative lengths of your skeletal structure, which is unique in every individual and cannot be concealed by movement.

Start walking barefoot maybe? You'll stop heel striking and will likely change gait completely. People will also start to think you're loony too, which has it's ups and downs.

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