I was a dumb line cook for more than 18 years. Learned a lot and got paid to play with knives and fire while flirting with servers, but it's typically a young man's game.
I hope you enjoy it and your knees, legs, and back are holding up. While I miss it at times, my body doesn't.
5-6 years ago I had constant pain in my feet and knees and back. I was taking ibuprofen before every shift and it felt like that was just my life.
My prep table was at a height - about 2 inches below optimal - and it felt like I was constantly just barely hunched over it.
I tried different insoles and used those padded floor mats (which are a bitch bc you have to clean them every night).
Nothing really worked until I tried...
Boots.
We use non-slips of course, but so many of the styles are flimsy and lack real support. I'm a big guy.
It was like an overnight 180°. I've not had any pain since switching to heavy non-slip boots.