I took the easy way out on this one and had it done by someone at the gym.
She measured seven different point on my body and used a chart with sex, weight, age and I think height to figure it out.
What pissed me off about the chart she used is that when I turned 30, my BF was bumped up 5% because of age.
The most accurate test is the one where they dunk you in water, can't remember what its called.
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Just another day in the gutter