Basic buoyancy question

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Firebrand:
When I did my lifeguard cert, I had to hold a 10-pound weight and tread water for five minutes. That was tiring, but not difficult.
Yes, had to swim down (10ft) and grab it bring it up and swim a length with it on your hip. It was not as dificult as it sounds.. I would think treading water with it would be worse.
 
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