Answer:
What you become during a workout?
Passed from father to son and shared between brothers, its importance is unquestioned though it is used more by others.
I question what lies above, and Iām shared with those you love. At my sound your hands will shake, and oft heard soon after wake. A card not found in a deck.
What is full of holes but still holds water?
You do this into someone's ear when you want to be discreet.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.