imo:
Olympic: a trained athlete who only peaks in one or two aspects but not all across the board for example some olympics are peak strength like punisher and damage soak but only have the olympic human reaction, agility or speed..
Peak: across the board evenly distributed capabilities at the height of current human physiology for their height and weight. strength, speed, damage soak... Cassie is a special case as she operates at full peak in all aspects in conjunction with her other attributes which make her appear slight superhuman alongside Cap but she is simply the pinnacle of current human peak as was once considered for Cap.
Cap falls more along the lines of enhanced humans as in not only is he always operating at peak all across the board at a baseline but he has a few added effects to go along with his strength, speed, durability and mental processes. once the adrenaline starts flowing he exceeds any and all current physical human limitations he is the next rung on the human evolutionary latter something humanity has not yet reach.. something bats no matter how long he trains could not hope to become.
that is reserved for the likes of Slade and a few enhanced beings.
then you have the low metas or slight superhuman who obviously surpasses any and most enhanced human limitation as if it was an every day thing and as stressful as picking up a beer from the fridge but i wont say names of ppl who belong here it would simply piss ppl off..
but we all know the two most famous guys who belongs in this list...