My experience is that after two doses of Pfizer I had unexpected positive side effects, such as increased performance (e.g. I can do a lot more push-ups) and my

My experience is that after two doses of Pfizer I had unexpected positive side effects, such as increased performance (e.g. I can do a lot more push-ups) and my allergy symptoms (runny nose) have significantly decreased. Do you know any research on unexpected positive side effects?