Makenna Myler Attempts Sub-Five Minute Mile at Nine Months Pregnant to Champion Maternal Support

In a display of athletic prowess that challenges conventional perceptions of pregnancy, professional runner Makenna Myler is preparing to undertake a high-intensity physical challenge: running a one-mile race in under five minutes while nine months pregnant. The event, scheduled for October 9, 2026, in Highland, Utah, represents not only a pursuit of a personal performance milestone but also a broader campaign to highlight the necessity of institutional support for mothers in professional sports. Myler, a former Brigham Young University (BYU) standout, has previously demonstrated that her training regimen, when managed under medical supervision, yields results that defy standard physiological expectations for late-term gestation.

The Evolution of a Record-Breaking Journey

Myler’s current endeavor is the culmination of a multi-year trajectory involving three consecutive pregnancies, each documented by significant athletic milestones. Her foray into high-intensity pregnancy running began six years ago during her first pregnancy. At that time, she completed a one-mile run in 5 minutes and 25 seconds while nine months pregnant. This performance, while impressive, served as a baseline for future endeavors.

Three years later, during her second pregnancy, Myler improved her mark significantly, clocking a 5-minute and 17-second mile. According to regional reports from KSL, this time is widely considered the fastest documented mile run by a woman at nine months gestation. These achievements are not the result of impulsive decisions but are rooted in a lifetime of elite-level conditioning. Myler’s professional credentials include a half-marathon personal best of 1 hour, 7 minutes, and 37 seconds, and a marathon personal best of 2 hours, 26 minutes, and 14 seconds. Having competed in the 2024 U.S. Olympic Marathon Trials, Myler’s baseline capability—a personal best mile time of 4 minutes and 37 seconds—provides the necessary physiological foundation for her to attempt a sub-five-minute mile even in her current physical state.

The Sub 5 at 9 Initiative and Philanthropic Mission

The event, titled "Sub 5 at 9," is set to take place at Provo High School in Utah. While the athletic goal is ambitious, Myler emphasizes that the primary objective is altruistic. The race serves as a fundraiser for "For All Mothers," an organization dedicated to providing structural support for female athletes who are also parents. This includes lobbying for, and providing funding for, essential services such as on-site childcare and lactation facilities at athletic venues.

Myler’s advocacy stems from the belief that professional sports environments are historically designed without the inclusion of maternal needs. By leveraging her visibility, she aims to demonstrate that motherhood should not be an impediment to professional longevity. "I am running to advocate for a shift in how we support women in sports," Myler noted in discussions surrounding the event. She argues that the support system—whether it is financial assistance, access to professional training, or childcare—is the determining factor in whether a woman can sustain a high-level career while raising a family.

Physiological Adaptation and Training Methodology

Transitioning from her previous pregnancies, Myler has refined her training methodology. In her first pregnancy, she operated under a more cautious framework, utilizing high-intensity bursts with less volume. For her third pregnancy, Myler has shifted her strategy toward a higher-volume approach with a deliberate emphasis on recovery and mental health.

Medical experts note that athletic performance during pregnancy is highly individualized. The physiological changes during the third trimester—including increased blood volume, changes in the center of gravity, and the release of relaxin, a hormone that loosens ligaments—pose significant risks if not managed correctly. Myler’s routine currently involves one high-intensity training session per week, supplemented by lower-intensity work that prioritizes consistency over peak exertion. She has publicly acknowledged the necessity of listening to her body, noting that performance during pregnancy is non-linear and requires the athlete to accept fluctuations in pace and physical capacity.

Medical Guidelines and Safety Considerations

The American College of Obstetricians and Gynecologists (ACOG) provides the gold standard for prenatal exercise guidelines. For healthy pregnancies without obstetric or medical complications, ACOG recommends at least 150 minutes of moderate-intensity aerobic activity per week. However, the intensity of Myler’s training falls outside the scope of typical prenatal recommendations.

Medical professionals emphasize that Myler’s case is an outlier due to her status as a professional athlete. For the general population, the focus remains on maintaining cardiovascular health without overexertion. Physicians warn that "red flag" symptoms must be treated with immediate cessation of activity. These include:

• Vaginal bleeding or fluid leakage.
• Dizziness, lightheadedness, or signs of impending syncope.
• Persistent chest pain or dyspnea (shortness of breath) occurring before exercise.
• Significant muscle weakness or calf pain/swelling (potential indicators of deep vein thrombosis).
• Regular, painful uterine contractions.

The distinction between a seasoned professional like Myler and the average expectant mother is critical. Her ability to maintain high speeds is predicated on years of neuromuscular adaptation, whereas a sedentary individual beginning an exercise regimen during pregnancy must adhere to a much more gradual progression.

Broader Implications for Women in Sports

Myler’s project highlights a growing movement within the sports industry to formalize support for pregnant and postpartum athletes. Recent years have seen a shift in corporate sponsorship agreements, with major athletic brands now including "pregnancy protection" clauses that prevent the reduction of athlete salaries during and immediately after pregnancy.

The "Sub 5 at 9" event serves as a microcosm for this cultural shift. By bridging the gap between extreme athletic performance and the realities of motherhood, Myler is forcing a conversation about equity. Her narrative challenges the "motherhood penalty" that has historically plagued women’s careers in competitive fields. The event is not merely an exhibition of speed, but a calculated political act intended to prove that when adequate infrastructure exists, the binary choice between a career and motherhood can be dismantled.

Conclusion and Future Outlook

As the October 9, 2026, date approaches, the eyes of the athletic community remain fixed on the track at Provo High School. Regardless of whether Myler successfully breaks the five-minute barrier, the effort has already succeeded in garnering significant attention for the "For All Mothers" initiative.

The lasting impact of Myler’s career—and specifically these prenatal runs—will likely be found in the changing expectations of what is possible for the human body. As sports science continues to evolve, the boundaries of pregnancy and physical exertion are being redefined. However, the medical community maintains a firm stance: individual health and safety must remain the primary metric of success. Myler’s success, facilitated by a dedicated team of coaches and medical advisors, underscores that while extraordinary feats are possible, they require a foundation of professional-grade support and medical oversight that is currently inaccessible to the vast majority of women. For now, Myler remains a symbol of the intersection between human performance, maternal autonomy, and the ongoing fight for systemic support for women in the professional arena.