A "weighted ball" is a ball that has extra weight added to it. This extra weight can make the ball heavier and harder to throw or use, but it can also be used to improve strength and skill in sports or exercise. Full definition
I honestly think the best one is that perfectly weighted ball for the assist, but that's just me. (theshortfuse.sbnation.com)
All around, kids were playing with weighted balls and air jets and floppy rockets, all looking fairly happy. (discovermagazine.com)
It also ranges from baseball players throwing weighted balls or using weighted bats not to mention my favorite for looking hardcore, the elevation training mask. (breakingmuscle.com)