[Jebusfathead]

I've actually heard of this but I think it's just a mind trick tbh. Like you will be better which makes you believe you will be better.

The placebo effect. When you believe something to an extent your mind can actually force your body to do it. For example there have been trials where doctors have given people with a common cold a 'miracle drug' guaranteed to work etc etc and it worked for some patients. Except the pill was just a sugar pill.