New to “functional training”, 37M

I’ve been consistently training since 2018, typically doing either Upper/Lower or PPL bodybuilding splits for 5x a week. 7-8k steps a day + bikram yoga on my off day.

I count my macros and adhere to it by about 80-90%. I am hovering around 15-18% body fat.

I’m curious about “functional training”. I’ve seen a lot of social media posts lately that it’s possible to train for aesthetics, athleticism, explosiveness, durability and longevity. (Jason Brown, Marcus Filly, Justin Lienhard etc)

Where do I even start or is this another fad? Any recs for coaches or programs?