I get what you're saying, but I kinda disagree. First, humans are a very visual animal. Vision is newarly the only sense that we need to have to percieve our environment. When we see a beautiful or an ugly person, it really affects our feelings.
But I think muscular men are way more disciplined than the average person, which means their personality may not be kind t others, but their soul is braver and their psychological state is better.
I think that self discipline, at least for me and other people, is unlearnable. All my life I've been struggling to have self discipline and all I got from it was mental collapse that led to a permanent mental disability. I've been wanting to die for 11 years. I can't function on a daily basis, I'm always emotionally overwhelmed and exhausted. I just want other people to acknowledge that it's not my fault and be more forgiving towards me.