It had been close there and he still felt his heart pumping hard from the effort.

Stone's heart was still pumping hard from his dash to the airport.

I started to breathe faster, felt my heart pumping harder.

Despite his good advice, I could feel my pulse pumping harder.

I rest on the top of the wall, my hands shaking, my heart pumping hard.

He pumped harder, gaining more height, and looked down half a minute later.

And then they saw the man dressed all in black, his spindly legs pumping hard as he came at them.

Jupiter whirled around and started back, his legs pumping hard.

This prevents a fall in pressure, even though the heart must suddenly pump harder against gravity.