Why would a guy send me a video of him lifting weights?

It was just really odd. I don't know this guy well, and he sent a video of himself on his phone lifting free weights...Guys, would you ever do this? And this is a guy in his thirties...not a teenager.
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I'm not sure if you can see it...but here is the link...it is weird...
Why would a guy send me a video of him lifting weights?
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