Here is a 300lbs medicine ball made to prepare you for strongman competitions. The D-Ball Atlas Ball is a 15″ slam ball with a smooth, non-dimpled surface and raised rib rings for easier grip. You can lift, slam, and throw these. They are available at lower weights down to 150lb.
Trending fitness gear:
These are filled with a mixture of materials that give you a consistent feel as you exercise. Not cheap though.
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