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The few hours of sleep, the crowded subway or long commute in the car, the endless hours sitting in an uncomfortable office chair looking at a computer screen... the hustle and bustle of everyday life can lead to problems with our back, neck, and knees. But there is something you can do about this and you only need one inexpensive item: tennis balls! Use them to do these simple exercises as often as possible and you might just be able to avoid a trip to the physiotherapist or chiropractor. Watch the following video to see how.