Abstract: A tension spring is attached at each end to a pair of mounting brackets attached to a portable pedestal. The spring is enclosed in a cylindrical housing and one end of the spring is attached to the mounting bracket by an eye bolt that can be adjusted to increase or decrease spring tension. A twisting turn of the housing by a human hand exerts a return force on the hand through the spring with consequent tension being exerted on hand and forearm muscles as long as the housing is continuously gripped.