In many Mega-Cities, the annual Marathon- or Running-event is the biggest One-day-event of the year – not only with regards to the people being active on the streets. Urs Weber shows the quality of the running-trend and how numbers and the popularity of running events are growing. Julius Ranft has led a study on the effects of the Berlin marathons and shows spectacular figures from last year's Berlin marathon, reaching from economic turnaround of the event, spin-off-effects for the city, and the city marketing as well as a target group analysis.