And to spice up the discussion, if you dont know, what do YOU think is the reason? ;-)
never did that, but so far as i know or guess, it is related to Chinese medicine theory, which understand the body not by visible cell or organ but by invisible Jing/Luo.
Thus,stepping backward is believed as using an alternative way to motivate the usage of Jing/Luo, similar to some practices like head stand, in Yoga theory. or think about Gongfu, which is also related to Chinese medicine theory or fundamentally, Yi Jing.
coz it burns several times more calories than traditional way of jogging exercise, your balance increases, ur vision and hearing powers increase.i think its good 4 u too :P
beating is for activate acupuncture point~ I guess.
Interesting, I never saw noticed that!
I see a lot of Chineses in the gym but never saw they walking backwards.