The human foot is designed to absorb the impact of walking and running, without the need for shoes.
Unfortunately, the modern trend to wearing shoes has lead to the atrophy of many of the small muscles in the foot that provide natural shock absorption. Many of the problems that people supposedly wear cushioning shoes to avoid, are actually caused by the wearing of shoes in the first place.
While there are many successful barefoot or minimalist runners and walkers, it is something you need to build up to over time, to allow those small muscles to get stronger. Going barefoot for moderate indoor exercise (which includes WATP videos) is actually a good way of rebuilding those muscles - just don't push too far too fast, and listen to what your body is telling you.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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