@dawn16 Well tbh I'm not sure. Because as I already mentioned, he gets criticized a lot on reddit. I've actually noticed some of his claims contradicting others that he made in the past, and to be honest, I believe he is trying to reinvent the wheel too often by proposing many weird exercises which probably can be useful and do make sense in some way, but are not necessary to do at all and just fuel the confusion that many beginners have (due to all the different stuff you could do, all the different exercises one can choose from).
Apart from that, some things AthleanX says contradict a lot of the opinions in this subreddit.
How to perform the pushup for example: As already mentioned in this thread, Cavaliere advises to retract the shoulder blades throughout the whole movement (keep the shoulders behind the chest). I asked this subreddit about exactly that just 1-2 months ago, because the wiki advises to protract the shoulder blades at the end of the movement (bring the shoulders in front of the chest). Everybody answering to my question confirmed the wiki's claims and told me to protract the shoulder blades, therefore contradicting AthleanX's views. Another example is the dead hang in the beginning of a pullup: While the wiki and basically everyone on this subreddit advises to do it (relax every muscle in the back at the beginning/end of a pullup), AthleanX says it puts way too much stress on the joints and is therefore very dangerous.
I mean, Jeff Cavaliere is a famous coach and also a physical therapist, but I am not sure about a lot of his claims, especially since this subreddit contradicts many of them.