yep, cheap ones actually burns more calorie, maybe

来源: 于 2015-08-12 22:06:57 [旧帖] [给我悄悄话] 本文已被阅读：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