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A sinker is no freak of nature. Esp. for a lean-built, muscular person, usually a male, it's not usual.
It's nearly impossible for a human with air in their lungs to be negatively bouyant, certainly not SIGNIFICANTLY so
My sarcasm went by without notice, did not mean to offend.
Here is an abstract for a study of 98 men, they were looking for the causes of drowning. All 98 were concluded to have enough personal buoyancy to float in fresh or salt water at full lung volume. Statistically, I think my opinion is realistic.
Human body buoyancy: a study of 98 men. [J Forensic Sci. 1977] - PubMed - NCBI
you can't teach someone who already knows everything.
all my life I have tried to convince floaters that I don't float and have received the same statements time and again, that I must be doing something wrong or not relaxing, etc.
I simply do not float.