Athletes were lacing up their running shoes and scarfing down pasta this weekend as they prepared for the 120th Boston Marathon on Monday.

More than more than 30,000 hailing from nearly 100 countries will be jogging the 26.2 miles from Hopkinton to Boylston Street this Patriots Day, by the Boston Athletic Association’s count.

The BAA also estimates the race will bring $188.8 million in spending to Greater Boston.

The first participants are scheduled to leave the starting line at 8:50 a.m., beginning with mobility impaired entrants.

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Officials are again asking spectators to take public transportation to get to their spot along the race route this year, and the T is bracing for thousands of additional riders. Trains and buses will be running at rush-hour capacity before and after the race, according to the T’s website.

Copley station will be closed all day, and three stops on the Green Line will be closed 10 a.m. to 6 p.m.: South Street, Kent Street and St. Mary’s Street.

Silver Line buses on the SL5 line won’t travel past Avenue De Lafayette toward Boylston Street.

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Bikes are off-limits on T vehicles all day.

Officials have said security will remain tight along the race route. The list of items to leave home includes bags which aren’t see-through, coolers, props and other bulky items.

There has been no credible threat made against the race, officials said earlier this month.

The National Weather Service was forecasting sunny and mild conditions for race day, with highs in the mid 60s.