Given the task definition and input, reply with output. In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

This scrapping board can massage my back, legs and neck very well. It can relieve my fatigue after a day's work. It also improves the body's flexibility and stimulates the immune system. I am very satisfied with its effect on improving physical fitness.
positive