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The ordinary spring exerciser is one of the popular exercising devices. But it is trouble to add and remove springs when we want to change strength. And it will occasionally clamp the users arm as well, because the structure is fully exposed. This portable one performs a little better on these aspects. The strength can be modified easily by turning the knob. And the circle shape is determined by the inner structure, which is small and portable. We just need to draw out the hidden handles on both sides when we use it.