If you are flying from the European Union, there is a compensation clause in the aviation law that could see you make some money from a delayed flight. On flights that are delayed for at least three hours, passengers can claim compensation back from the airline.
While the airline might do everything within its power to prevent that three-hour delay from happening, if it does, you are entitled to money. So if your flight back to the States from Europe was delayed, look into getting something back for wasting your time.
Staying fit is certainly a commitment. Besides doing the physical training, there are some other factors to consider, like nutrition