Like a lot of fitness YouTubers, Rom GD has his own gym. Unlike a lot of them, Rom’s gym equipment is all DIY, using household and salvaged items. Weights are made out of sprockets, or plastic bottles filled with sand, or concrete cast into paint cans and flowerpots; bushings are PVC cast into the concrete. All of the standing equipment and benches have been welded up out of tube stock and angle irons.
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Here’s Rom casting some larger weights out of concrete, rebar and stone, followed by one of his patrons using them:
Here’s a look at the rest of the equipment in the gym:
There’s tons more on his channel.
Source: core77