Instruct: Classify the given review as either positive or negative.
Query: Lynx Portable Back Stretcher

I bought this piece of equipment because the hangup machine was hurting my knees because of age. It will take a few minutes to adjust the length to your body, but follow the instructions and it works very well. Will stretch you lower back, but is easy on the knees. Is all metal, so will last a long time. Would buy this item again.