Training to get stable stances and "snapping" kicks / punch for kata
Recently I got back into training Karate, Goju-Ryu on my own mostly because I don't have a local gym. I have a sensei that's a bit further away and some people I can ask for technical advice like how the stance should look etc. but they couldn't help me with this.
What I really want is to make my kata and form crisp and with no excessive movement. When I watch these amazing katas on YouTube from Olympics they just go into the stance. They don't stumble or balance out. They don't adjust weight distribution anymore.
The second thing is these crispy looking techniques. There seems to be no excessive movement in this.
What do I need to train(muscle training, weighted kata training?) to replicate this?
(I don't want to become a olympic master, I just want to make it look crispy and better)