Work, Energy, and Power / Climbing Stairs [Part 20/20] PDF Print E-mail
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Written by Thatcha Namnon   
Monday, 15 February 2016 10:56

How to calculate how many calories it takes to exercise an hour on the stair-master.

ที่มา :  http://www.youtube.com  อัพโหลดโดย  Michel van Biezen
 

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