This Sunday (26 April) tens of thousands of people will be pounding the streets of London attempting to complete the 26 miles and 385 yards of the London Marathon. Very few will be seriously running to win - most, I guess, are simply aiming to finish.
The Apostle Paul lived in a world heavily influenced by Greek and Roman culture. Athletics was therefore something that he knew about, and at several points in the New Testament he draws out parallels between the life of a top athlete and the Christian life.
In 1 Corinthians 9:24 we are encouraged to run in such a way as to get the prize. Top athletes have to be totally dedicated to their sport if they are going to be the best. They also make sure that they have all the right clothing. Running the marathon dressed like a rhino, may raise awareness and funds - helping to save the rhino - but even Paula Radcliffe wouldn't win in that.
In Hebrews 12:1 we are encouraged to throw off all that will hinder and the sin that so easily entangles. Yet many Christians try to win the race, whilst wearing a thick coat and carrying a heavy rucksack - all kinds of baggage from the past that holds them back.
Running 26.2 miles is hard going, and it would be very easy to give up - if it weren't for the crowd. If you have your name on your vest they will shout your name, and especially encourage those who are walking or stopped. We are in this Christian life together - we are not expected to do it all on our own - that's what the local church is all about. Being with others who can encourage us when we're down, so that we can encourage them when they're having a tough time (Hebrews 10:24-25).
There are many other parallels - maybe you can add some.