(NECN: Justin Michaels, Hopkinton, Mass.) - Runners are counting down the final hours until the start of the 116th Boston Marathon.
This year, they are not just focused on the course ahead - but also the high temperatures during the race.
Marathon officials are warning runners to take it slow, and to stay hydrated during the run.
Anyone who decides to sit this one out, and wait until next year's race, will not be penalized for doing so.
Here are some health tips for runners on dealing with heat:
1. Run at a slower pace and maintain hydration.
2. You should frequently take breaks by walking instead of running.
3. Heat stroke is a serious issue and is related to intensity of running as well as the heat and humidity.
4. Good hydration is important but over hydration is also dangerous.
For more information, go to the Boston Athletic Association's website.
NECN Reporter Justin Michaels has more from the starting point in Hopkinton, Mass. Watch the attached video for more.