100 Days

Spring '26 Majors

The reward for training through the bleakest days of winter? Race day in Tokyo, Boston and London. Our 100 Days training program is back for 2026 – an opportunity to log miles and hard work alongside your community, featuring a series of paced long runs designed for the pursuit of 26.2.

Tokyo

Tokyo represents the best of Japan’s dynamic running culture, renowned throughout the world for its depth and intensity. Cheered on by shouts of “Ganbatte,” Tokyo invites runners to celebrate the ceremony of our sport on a course that evokes the city’s past, present, and future.

TOKYO '26 WEEKEND

Boston

Boston has long represented the pursuit of personal excellence, inspiring runners of all levels to chase qualifying and test their mettle on its iconic course. Over the rolling 26.2 miles from Hopkinton Green to Boylston Street, each runner becomes a part of marathon history.

100 DAYS TO BOSTON

London

With its wall-to-wall crowds and a finish in front of Buckingham Palace, London sneaks a party inside a marathon – which is why millions of runners entered the lottery. From record-chasing elites to “good for age” racers, first-timers to costume-wearers, there’s something for everyone.

100 DAYS TO LONDON

Ready to Race

Join us in London, Boston and New York for your spring marathon build. Designed to support your marathon goals and build community, this free training program features paced workouts, route rehearsals, expert insights and more.

100 DAYS EVENTS

Pacing Groups

With a range of pacing groups from 6:30 to 12:00/mile (4:05 to 7:25/km), we offer workouts from hilly routes to progressive long runs specifically designed to help you smash your marathon goals.

Insider Knowledge

Our 100 Days program is led by our Tracksmith coaches and structured to support runners of all levels. From route preview runs, to expert-led talks, the Trackhouse is your hub for this training and community.

Runner's Passport

Along the way, you’ll use the 100 Days Passport to log your weekly progress, track key milestones, and stay connected - building confidence, strength, and momentum all the way to race day.

Shop the
Marathons Collection

Each of the seven world major marathons offers a unique opportunity for community, celebration and, yes, really fast racing. Our city-specific Marathon Collections are designed to celebrate your journey to the starting line. These are commemorative pieces you will treasure for miles to come.

SHOP COLLECTION

Trackhouse Communities

Part of our Boston or London communities, but running one of the fall marathons? Other than our usual weekly runs out of the Trackhouses, we'll be planning various sessions designed to support your marathon build, so that you're ready for race day. Stay up to date on all the happenings at our Trackhouse pages.