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As a lifter with a BMI of 26, it's not a very useful metric. Last time I measured my BF% with calipers it was around 9%...

Edit: Okay checked my spreadsheet, I misremembered. Honestly I don't track it that closely

Highly unlikely that you are at 4%; is my understanding that you can be at 4% BF for a short period of time:

Yeah not sure how accurate the calipers are, I pay more attention to if it's going up/down than the absolute value.

4% body fat is fatal really fast, isn't it?