Very handy device. I started using it for 5-10 minutes a day on the low end as recommended in their guide and increased the time and arch level after a few days. The manual is detailed and explains how to use the back stretcher without any harmful effects. The plastic is malleable and strong - it's very easy to install. has acupressure points that provide better support and the structure is more comfortable for the back, especially when you need to stretch for 10-15 minutes. You simply set your comfort level and lie on it. Need to have!
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