Learn how to juggle
Juggling is actually pretty easy
Once you get the hang of it, juggling is actually pretty easy as long as you are using easily catchable objects. If you want to juggle chainsaws or something on fire, you'll probably want to spend years practicing this art beforehand.
Once I learned the correct motion involved with juggling, it was easy to become fairly proficient. Juggling is a fun performance art that can be useful for entertaining small children who marvel at anyone with decent motor skills. Heck, I used to be impressed that Mr. Rogers could toss his shoe from his left to his right hand at the beginning of the show (What was the deal with that anyway? He changed his shoes when he came indoors. Does anyone else wear a special pair of indoor shoes?).
2 Balls, 1 Hand
The best way to start is to practice with 2 balls, preferably light balls like tennis balls, and use just one hand. Try to get a cyclic motion going. Toss the ball upward away from your body, but try to toss it so it falls closer to your body. Toss the other ball the same way, and bring your hand in closer to your body after the toss. This should put it into position to catch the first ball, which you should immediately reach out away from your body and toss back up in the air. So the basic motion of your hand is out and in, out and in, out and in. You just want to make sure the follow through of your toss puts your hand in a position to catch the other ball.
3 balls, two hands
The basic juggling combo is 3 balls with two hands. Start with 2 balls in your right hand and one ball in your left. Toss one ball from the right hand up and to the left. Right before you catch that ball with your left hand, release the ball from that left hand up and to the right. Once again, you're going to attempt to make it so your left hand follows through in a position to catch the ball coming from the right hand. After you complete that motion, you have one ball in the air headed toward your right hand. Release the ball from your right hand and catch the ball coming from the left. You see, for most of the time you only actually have 1 ball in the air. It's only that brief moment after you release one ball to free up that hand to catch another ball that you have 2 balls in the air. You never have to concentrate on catching 2 balls at the same time.