Run 100 miles, 50 miles, 25 miles or a marathon around your block.
Choose a loop, hill repeat or out-and-back section of 5 miles (or less) and repeat it over and over and over again until you have hit your distance of choice.
This race is open to everyone. There is no cost. There is no time limit. There is no quitting.
For more information and to sign-up and get swag, visit www.aroundtheblock100.com. Sign-up officially at http://ultrasignup.com/register.aspx?did=77203
You can start your race whenever you want to (even though Ultrasignup has a specified start date).