Vote: Could you run a marathon?

Would you put yourself through the challenge?

Updated: 

This Sunday, around 50,000 people will run the Virgin London Marathon.

Runners will be pushed to their limits as they take on the 26 mile course, starting in Greenwich and ending at The Mall.

While many people have running a marathon on their bucket lists, for some it is their worst nightmare.

There's also some super fit people who have run more than one.