Jambo, welcome to Kilometre Forty. I am Mercy Chebet, I ran a 2:28 marathon once upon a time, and now I coach runners of every speed on the dirt roads above Iten. This is the show about the whole distance, the easy bits, the hard bits and the bit at kilometre forty where everyone becomes a philosopher. Today, the question every visitor asks me. Why do Kenyan champions run so slowly on easy days? I will explain the rhythm of our training week, why slow makes fast possible, and how you can borrow the idea even if you run four times a week in a city at sea level. Then I take you on a Monday morning run with my group, microphone on, so you can hear how much we talk. You are listening on Witspeak Podcasts. Lace up.