Baseballs are a good kind of ball to practice with.

As you get better, you can work on tossing the balls faster.

Keep doing this until you’re able to toss the ball back and forth between your hands without dropping it or looking down at your hands.

A popular variation of 3-ball juggling you can try is the cascade. Instead of tossing all 3 balls in quick succession, toss 2 balls and wait until you catch 1 of them before you toss the third. Everytime a ball peaks above your head, toss a new ball. There should only ever be 2 balls in the air at once.