Planking:abriefhistoryTherulesaresimple:youmustliefaced...
问题详情：Planking:abriefhistoryTherulesaresimple:youmustliefacedown,palms(手掌)flatagainstyoursides,withyourfeettogetherandpointingattheground.Pointsareawardedforanoriginallocationandforthenumberofonlo...