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Assumption of risk

Not medical or safety advice. Plans, paces, fueling, turnaround times, tide or current estimates, and trip estimates are general calculations from the information you enter, and they may be wrong. Exercise, endurance events, hiking, cycling, paddling, and time outdoors carry a risk of serious injury or death. Consult a physician before beginning a training program, especially if you are pregnant, injured, or have a health condition. Check official weather, trail, park, tide, and water conditions, carry the safety gear the trip requires, and turn back when conditions require it. You participate at your own risk. Fueling suggestions are not nutritional advice for allergies or medical conditions.

AI output

This tool uses artificial intelligence provided by xAI. AI output may be inaccurate, incomplete, biased, or made up. Review and edit it before you rely on it, publish it, or give it to anyone. Do not submit confidential, personal, health, or client-identifying information. Text you submit is sent to xAI to generate a response. LIGHT & SALT BROADCASTING (LSB) LLC does not use that text to train its models.

Free preview

Tell it the course and the clock.

A named marathon fills an approximate elevation profile. A GPX file uses the elevation in the track. You will see the first 5 miles before anyone asks for a card.

The course

Boston Marathon uses an approximate elevation profile stored with the app. It is for planning a band, not a surveyed course map. Upload a GPX file if you have the track.

Goal and strategy

Hours

Minutes

Seconds

Course Pace Band is a pacing chart, not a prediction that you will run the goal time, and not medical advice. Preset elevations are approximate planning profiles, not a survey. A GPX file is only as good as its elevation track. Heat, wind, and crowds will move the clock.