Mireille Sine running through a Los Angeles street wearing an orange tank and green tights

hey, i’m mireille!

I’m a passionate run coach, health educator, autoimmune athlete, and wellness advocate dedicated to helping runners achieve their goals. Whether you’re gearing up for your first 5K, a marathon, or simply looking to improve your fitness, I’m here to guide and support you every step of the way.

As an avid runner myself, I understand the triumphs and challenges that come with training. My coaching philosophy is built on the belief that every runner has their unique journey. I work closely with my clients to create personalized training plans that not only align with their goals but also fit into their busy lives.

One area I’m especially passionate about is empowering runners with autoimmune conditions to thrive in their training. I understand the importance of balance, recovery, and tailored strategies to help you feel your best while chasing your running dreams.

In addition to one-on-one coaching, I collaborate with corporations to bring running and wellness programs into the workplace. My goal is to help teams build community, stay active, and boost overall well-being through running.

When I’m not coaching or running, I enjoy creating engaging content to inspire runners worldwide, connecting with my community on Instagram & IRL, and sharing tips on how to make running a sustainable and joyful part of life.

Let’s work together to make your running goals a reality! Whether you're aiming for a new PR, improving your strength, or building a healthier lifestyle, I’m here to help you achieve success—one stride at a time.

Want to see if we’re a good match? Click the button below to complete an interest form. I will reach out for a free introductory call!

Certifications & Accomplishments

USA Track & Field Certification
Certified Coaches Collective Certification
80/20 Endurance Coaching Certification
  • Bachelors of Science in Exercise Science

  • Master in Public Health

  • USA Track & Field Level 1 Certified

  • 80/20 Endurance Certified Coach

  • Training Peaks Certified

  • COCI Apprentice Alumni

  • Coaches Collective Certified

  • Completed 13 full marathons and counting

  • 50k-50 miler ultra finisher

  • Completed “Boston to NYC” Expedition (200 miles in 11 days)

  • Completed “The Speed Project” (Running from Los Angeles to Las Vegas)

  • Have helped lots of happy, accomplished athletes!