RE: Working out naked

I'm about to start a versa-band workout, which I expect to be doing naked as often as possible, but that will mostly be at home. As I was walking at Black's Beach this weekend the thought occurred to me of bringing some durable bags (like burlap or that woven plastic material that tarps are made of) that could be filled with sand then emptied when done would be a great way to get a workout in at the beach without having to carry some heavy dumbbells in and out. I'm sure such a product exists already. I can't be the first person to have that idea.

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