Context: Impressed at my endurance after working out.
Speaker 1: Today I was quite impressed with my endurance during my work out. A few months ago, I couldn't even walk up a flight of stairs without losing my breath.
Speaker 2: Sound like you're making a lot of progress!
Speaker 1: I sure have, but it's such hard work. I make sure to work out, even on the days that I don't want to. It's definitely taken a lot of will power.
Speaker 2: That's great! All the hard work is paying off.