A simple toy demonstration shows the effect of lifting posture on our back https://t.co/Jhij5CFh16 https://video.twimg.com/ext_tw_video/1829393034028425217/pu/vid/avc1/720x746/9N4-0cmJ8rWwxpbv.mp4?tag=12
A simple toy demonstration shows the effect of lifting posture on our back https://t.co/Jhij5CFh16 https://video.twimg.com/ext_tw_video/1829393034028425217/pu/vid/avc1/720x746/9N4-0cmJ8rWwxpbv.mp4?tag=12
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