Your body is designed to handle it, so it's not a problem when done for short periods of time. Our circulatory system has features to help maintain blood flow and prevent pooling in the legs because the legs are normally down. We don't have as much for the upside-down position because we don't spend much time that way.
The main benefit of hanging upside down is stretching the spine. We spend so much time upright that the spine tends to compress. Occasional spinal stretching helps counter this. All of our joints benefit from gentle stretching through their entire range of motion, especially as we age.
for humans not bats
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