I was out wogging (walk/jogging) yesterday in the park where there is a 1 mile road around the perimeter. So, a guy runs by me - a real fit runner - and says 'hi'. Then each time he'd lap me (which was often) he'd smile or say something. After about half an hour, when he was lapping me again, he looked back and said "You're doing really well". Wow, I was pumped for the rest of my jog. Even though I'm sure he was just encouraging me it felt so good to have someone even notice I was there.
It really made my day.