>>76353655 (OP)the biggest one is "Paul Wade" (probably a pen name), who wrote the book Convict Conditioning. That's what really got me started with fitness, after 2 failed attempts to attend a gym (quit after a few months because it just took too much time to get there)
Then there's Dr. Berg, who taught me enough about cell biology and nutrition to successfully reverse my type 2 diabetes. (not everything he promotes works or is healthy, so don't watch him if you're the blind follower type and not intelligent enough to do your own research on what he says)
As for youtubers I learned a few good things from, there are
Juggler Maro
CalisthenicMovement
FitnessFAQ's
The Bioneer
Jeff Nippard
Thomas DeLauer
Simonster