A man in China credits his daily walk in shoes weighing 400 pounds each for curing hemorrhoids and back pain, and now he's selling stylish iron boots around the country. Zhang Fuxing has been walking in the iron shoes for seven years, and says it's not a matter of muscle strength. Zhang, a 52-year old factory worker in the city of Tangshan, says that "the power comes from internal organs [...] When you walk with your heart it will work.”

He takes short walks of 10 - 15 meters every day, and says his severe back pain was cured about a month into the exercise.

A pair of the heaviest, weighing in at around 130 pounds each, costs about $240 USD. Zhang also offers a more fashionable red pair of 22-pound shoes for $90 USD. So far, he says he's sold hundreds of pairs. His neighbors are some of his most loyal customers. “We’ve all worn his iron shoes, it makes your legs feel better,” said Chen Guanghua, a woman in her sixties. “We can’t all play badminton, but anyone can wear shoes.”

Watch Zhang take a stroll in his 800-pound pair here: