Juggling is fun, it’s a nice break, you can do it anywhere, and at any level. If you do not have juggling balls, you can easily make them yourself. See the video below or search YouTube for more examples. Some use rice, others flour. We experienced that making juggling balls from (old) tennis balls is the easiest and gives the best result.
Now you can start juggling. First a video for young kids and thereafter more technical video on how to learn juggling.
Juggling, just like training any physical activity, changes the brain. Read The Art of Changing the Brain or Juggling Boosts the Brain (Nature, 2004). We do not wish to spoil the game, but there is mathematics in juggling. See Math is in the air.
DiScoro 
This is cool. I learned to juggle by practising like five minutes each day, and was able to do it decently after a couple of weeks. Thanks for sharing!