Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fit Match the Heavyhands Perfectly

The additional weight helps increase your calorie burning and tone the upper body during those long walks. Beware that these 9 lb add-ons are rather heavy and you should experiment with the smaller weights first - especially if you are older and may not be able to tolerate the additional stresses of more weight on your ankle, knee or hip joints.