Jennifer MacDonell, 70, from Ottawa, is set to challenge the W70-74 marathon world record at the TCS Toronto Waterfront Marathon. The current record of 3:27:00 was set by Laurence Dupont Alnet in 2024. MacDonell has been meticulously preparing for months, studying the course and adjusting her training.

With decades of running experience, MacDonell has focused on the marathon distance. She has accumulated numerous age-group records and won the Manitoba Marathon. Despite her achievements, she remains motivated by small breakthroughs and personal goals. Her recent 5K finish in 21:19 showcased significant improvement. Read more racing coverage.

MacDonell’s training includes deliberate hill runs and heat acclimatization. She credits her coach, Steve Boyd, and her husband, Norman Marcotte, for their support. The Toronto Waterfront Marathon organizers have also been supportive, responding enthusiastically to her record attempt. MacDonell’s ultimate goal is to test her limits and answer her lifelong question: how fast can she really go? Related: Brigid Kosgei Returns to Chicago Marathon with Tokyo Record Fresh.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.