>> be grateful for running, i always remember the people that i run for and the i always make a special tribute at the finish line like big papi does looking up to the people they've changed so many lives. they've made better people of ourselves. >> reporter: and ana, 30,000 runners participating this year representing more than 100 countries. the race always kicks off in hopkinton and crosses eight different cities and towns, and right now all eyes are kind of on the skies right now it's a little cold, it's starting to rain a little bit, but we're told that some of these elite runners will li...