yep, cheap ones actually burns more calorie, maybe

來源: 於 2015-08-12 22:06:57 [舊帖] [給我悄悄話] 本文已被閱讀：次

yep, cheap ones actually burns more calorie, maybe because less "free bounce" relaxation period?  I have knee problem so I have to go with the JumpSport 350i