I have followed this bloke twice in the last few weeks. He seems to be about 55 years old, 5 feet tall and he goes like the clappers. The first time I followed him, I was going too fast to safely take the camera out of my pocket to grab a snap. He had slowed down marginally today - just enough for me to risk grabbing a photo.
This photo is a bit grainy, but check out the calf muscles on the old dude.