Hello so I am currently making a game called Muscle Island, the game is a simulator about lifting weights and I need 10 more weights and im out of ideas, for example here are the current ones we have:
Black Hole Weight
Concrete Brick Weight
Dumbell
Barbell
Good Choice! xD
My creativity is pretty low rn but here are some words that could maybe help you :
Do there have to be weights or can I say something like chair?
Anything LOL, just needs to be cool
Ok then, how about a chair? lol
Yes good idea Ill have office chair as one 
Would a Bowling Ball be good? it was the first thing that came to my mind
Maybe use realistic things that would develop the interest of players, but not too realistic to push the age range of the players away so using things like bricks maybe or cars just to make it a bit more fun for those who are playing it, as the players gain the capabilities to withhold more weight, the assets could begin to get bigger and transform from a car into something like a house?
Bit late. You should add a gym bench and the squat rack lol