person A: Today I was quite impressed with my endurance during my work out. A few months ago_comma_ I couldn't even walk up a flight of stairs without losing my breath.
person B: Sound like you're making a lot of progress!
person A: I sure have_comma_ but it's such hard work. I make sure to work out_comma_ even on the days that I don't want to. It's definitely taken a lot of will power.
person B: That's great! All the hard work is paying off.