Debris and other discarded items often found on the ground or walkways are usually unlikely to do any harm to someone's bare feet.
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Most debris on the ground is not hazardous to bare feet — Born to Live Barefoot
Barefoot Running Magazine - Issue 15 (Autumn/Winter 2015) by Barefoot Running Magazine - Issuu
Get Grounded: The Surprising Benefits of Being Barefoot
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bare feet of a person on dry soil without plants close up - a Royalty Free Stock Photo from Photocase
If you walk barefoot all the time do your feet become resistant to the tough ground? - Quora
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Get Grounded: The Surprising Benefits of Being Barefoot
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Performance Appraisal For Your Feet, by Jimmy Nyende, Mar, 2024