With mouths wide open, they unselfishly loved humankind.

Found in a gym, helps strengthen a back Found in a floor, can help cover a room Found in politics, a stand which to yack Found on a ship, sends a pirate to doom

I may, or may not exist on a material plane, but I am the one who divides the space, and The one who stops everyone from moving forward. What am I?

I mark your love with simple shape, yet beat within your chest each day. I race, I rest, I fall apart, what am I that plays both parts?

I steal moments without a sound, I trap the light when it spins around. I open one eye, then close it tight, And freeze your laughter in pure white. What am I?