It's finally time for the Boston Marathon. Here are the celebrities, influencers, professional athletes, and notable participants running in 2025.

This segment actually affects pros and amateurs pretty equally, although elite runners fared slightly better. Strava found that 47 percent of pro runners slowed down 5 percent or more at Heartbreak Hill, while 56 percent of amateur runners slowed down here, also by 5 percent or more.

Boston Marathon features the deepest and fastest American field, with each runner at different points in their career.