Executing fast is important, but practice slowly. It is frustrating as heck to admit it, but forcing your body to do something slowly is very effective at learning to do it at speed.
Like riding a bike, you start slow with training wheels (or a helicopter parent) and work your way up to Yolo no-hander off that kicker ramp at 40 kph.
I suppose you can somewhat metaphorically replace speed with numbers there. In that juggling four balls is a lot like three, but faster. Getting the initial three going, though... Grrr.
4? My brain revolts.
You need not limit yourself to a single gravitational constant.
I look forward to video clips of Elon juggling on Mars!
Balance bikes are a better first step and are actually really fun compared to training wheels.