Have you ever heard of pacemaker? No, not about cardial pacemaker – I am talking about pacemaker at Marathon distance runs. They are usually carrying a flag showing the target time 3:00 h, 3:15 h, 3:30 h, 3:45 h and so on. Yes, of course also in science there are pacemaker at all levels, some have even flags without ever participating in a race. I have just read a nice book of Joachim Stall and Matthias Klumpp about “Running with music” that has a list of songs with beats per minute – surf to joggymeter. Yea, yea.