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Upgraded Ergonomic Design Structure - Our back stretcher design increases the back contact area, the ergonomic design safely supports your back, through deep pressing on 114 contacts can massage the waist points specific acupoints and promote circulation, helping you to relax the tension in the lumbar and back and relieve those aching muscles. Four-level Adjustable Back Support - Our back cracking device can be set to 4 different level angles. The higher the arch, the more of a stretch you receive. It is ideal for sciatica pain and lower back pain relief. Lie down and relax for 5 - 10 minutes each time, twice a day. The Spine board is equipped with an EVA soft mat, which can provide cushioning so that you can use it more comfortably. Daily Back Stretching on Any Occasion - Our spine stretcher is made of environmentally friendly high-strength PP plastic and will not break and collapse in long-life use. Our lower back stretcher is designed to withhold a maximum of 400 pounds. This spine deck is lightweight and portable. It's convenient to use at home, in the car, in the gym, on a yoga mat, or in an office chair. For Yourself and Your Loved Ones - Our lumbar stretcher relieves back pressure by stimulating the back and restoring the natural line of the spine. Bring your cervical lumbar back to its youth and improve back pain symptoms! This spine board is worth trying for parents or friends with a lumbar back pain problem.