yep, cheap ones actually burns more calorie, maybe

来源: lilylan37 于 2015-08-12 22:06:57 [] [旧帖] [给我悄悄话] 阅读数 : (183 bytes)

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

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