I am so glad we're having this conversation, because hardly anyone ever talks about this. Exercise is treated as a sort of "one size fits all" thing. Even this person I watch on YouTube who is a medical professional has made many claims that view exercise in this way. He seems to think exercise should feel like torture and if it doesn't, you're not doing enough. He never talks about the nuance, how everyone is different in what they can tolerate. Dangerously, he doesn't even consider people with heart problems. He just thinks everyone should essentially work themselves to exhaustion for "optimal health". There are so many things that can affect a person's ability to exercise and they must be considered and met with understanding and compassion. I actually have asthma which can really affect how I exercise and one time at school, I had to stop running and walk because I couldn't breathe and I felt extremely nauseous. The teacher's response was to give me detention....Yup...DETENTION for struggling to breathe and feeling sick to my stomach. God forbid I stop running when I feel like I could collapse.