Keeping them in that plane is the biggest hurdle to get over for a lot of people. Try juggling in front of a wall. Or standing over a desk against a wall (no

Keeping them in that plane is the biggest hurdle to get over for a lot of people. Try juggling in front of a wall. Or standing over a desk against a wall (no chasing drops). You can even keep juggling bounces off the wall. Also, lots of practice with just two balls doing the exchange.