Here are some surefire tips on how to make that marathon day extra-special.
Two weeks before the marathon do a 20 miler after work. Do not do the whole 20 miles, make sure to stop after 18.5 because of the pain in your knee.
The next day enjoy the constant, painful reminders that you have done some real damage to your leg.
Remember that the marathon is not, in fact, 18.5 miles. It is much longer.
Well, maybe not profit as such.