Pelvic Clock lower back/core exercise device
thingiverse
This handy gadget simplifies doing the "pelvic clock" type of exercises, allowing you to place it at the base of your spine while lying down and then perform the exercises smoothly. To print this device, you'll need to use supports, which will add about $5 worth of plastic material. I printed mine with PETG filament, but using PLA should also work fine if you're printing on top of a yoga mat.
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