CBC News, 谈到walk backward to improve balance,
https://www.cbc.ca/radio/thecurrent/walking-backwards-exercise-benefits-1.7214361
跑步以后就很少做了, 偶尔想起来会running backwards .
https://www.cbc.ca/radio/thecurrent/walking-backwards-exercise-benefits-1.7214361
跑步以后就很少做了, 偶尔想起来会running backwards .