Stop researching, planning, and preparing. Just do the work.

It doesn't have to be brilliant. You just need to prove to yourself that you can produce something.

Whatever it is, be clear about what you’re going after and tie it to concrete actions. You can’t think your way to becoming mentally tough, you prove it to yourself by doing something in real life.

For many runners, the desire to do a marathon is about personal challenge. You might want to test your limits or prove that you can go the distance. Maybe you'd like to lose weight, get healthier or raise awareness for a charity.

Whatever your reason, hold on to it and remind yours...