Either physically or mentally - Tradução em português

I need to get used to write in English, so, here is my attempt. If I made any mistake in my text, feel free to correct it. If my message is convoluted, let me know and I'm going to correct it right away. Today, I was looking for the meaning of the word "burnout". By Oxford Learner's Dictionaries, the definition of the word "burnout" is:

"The state of being extremely tired or ill, either physically or mentally, because you have worked too hard."

In this case, "...either physically or mentally..." means seja fisicamente seja mentalmente?