喃喃自語的老頭 Old Man Mumbling,
xx The Ideal Cycling Speed Is 8 to 9 MPH, Says…
xx The Ideal Cycling Speed Is 8 to 9 MPH, Says…
"...for people vigorously exercising, the pollution inhalation can be several times greater than for people walking slowly,…
The optimal cycling speed to reduce pollution inhalation? Between 12-20km per hour http://ow.ly/dJBC305MuBA #Commute #EasyDoesIt