練腿力,省點錢!

[COLOR=#666666][FONT=Trebuchet MS]減少電梯使用次數,減少龐大電費開銷,身體更加健康![/FONT][/COLOR]
[IMG]http://1.bp.blogspot.com/-cmsFjv9kW9Q/Vd_vUhNAVcI/AAAAAAAABw8/_vM8j-QKWWk/s1600/stairsnb.png[/IMG]