Hands and feet- Put your best foot forward....
There are a number idiomatic expressions with hands and feet.
Here are a couple of examples:
put your best foot forward
It means: try as hard as you can.
Eg. "Don't worry about the interview. Just put your best foot forward and if you don't know the answer, don't be afraid to tell them you don't know. I'm sure you'll do fine."
count on the fingers of one hand
It means: something that happens very rarely or exists in very small numbers
Eg. You can count the number of times he's offered to buy the coffees on the fingers of one hand.