Yesterday me and Silje was on a orienteeringstraining in Asker and they had a quite fun version of common start: Dog race. Ut works like this: There is a common starte, and all have the same cource, but the controls are placed in a special way, so it's easy to skip a control. The the trainer starts 5 min. later, and tries to catch up as many runners as possible. When a runner has been catched, he/she may skip a control to get in front of the trainer.
We could'nt of cource follow the best runners, but Silje had a good pace og did'nt get much behind me. The trainer catched me halvway to control 9 ....
Below is my course. The colours is the how hard I was running. Red = Zone 5 , 90%-100% of max. hartbeat. Orange = Zone 4 (80-90%), Green = Zone 3. The marks are the controls.
My running profile: 