the finish line

never looked so good

From start to finish, we have your triathlon training covered.


The ability to reach for big goals and be part of a passionate triathlon community


Doing your best, no matter what training and racing throws at you


Following the D3 coaching philosophy and executing your race plan

Welcome to

D3 Multisport

Based in Boulder, CO, and coaching triathletes all over the world, our coaches create focused, effective programs that take the guesswork out of your training. We coach athletes of all abilities and understand that every athlete has different goals, however, having the desire, determination, and discipline to be your best are the common threads that tie D3 athletes together. Explore our website, ask us questions – we love to talk triathlon.
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Competitive triathletes often feel overwhelmed training to improve at all three sports simultaneously. At D3 Multisport, our coaching program gives you the custom training you need to get more done in less time, increase your training efficacy, and do more than just finish - you dominate!

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athlete experiences

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For the last two years, Coach Mike has helped me develop well thought out race plans that have increased my performance and allowed me to have very successful races.  Until working with Coach Mike, I never understood the complexities around developing race plans that incorporate effort, nutrition, and hydration.  These components are all interconnected to each other and are dependent on race distance.  Coach Mike was instrumental in helping me determine the right efforts for my fitness levels for both short (sprints and Olympic distance) and long course (half and full distance Ironman) racing.  To this day, his advice is essential as my fitness levels and capabilities are continuously changing.  These changes have a direct impact on my race plan.”

scott, 1-to-1 coached athlete

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I feel great! Anyone who asks about my Ironman has heard me tell them that I felt that my coach perfectly prepared me to finish feeling good and smilin'!

Nicole, 1-to-1 coached athlete

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I've never had a better race.  I felt great all the way through it.  My nutrition plan worked perfect and the wattage on the bike was just an awesome thing to have. Overall I beat my last half time by over an hour. I think 1 hour and 5 min. to be exact.  I finished 24/110 age group starters and 112/1000 starters.  Your coaching has definitely elevated my game and should put me in a great position for the Steelhead half in 3 weeks.  D3!

Jeff, custom training plan athlete

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I wanted to say thank you for calling me last New Years Eve.  You may not remember that call, but I do. You freely and openly gave me advice about my bike, and IMLP, and answered my questions. I also need to thank you for matching me up with my coach. He has been a great coach; supportive,  answered my questions and always replied to my emails quickly. I am officially an Ironman finisher!  It was a tall order to fill. There were definitely days when we both questioned how this journey would end. Its been almost 2 weeks now and I still have a giant grin on my face, and I'm still replaying the video of Mike Reilly calling my name at the finish line.

joanie, 1-to-1 coached athlete

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our D3 coaches have:

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Years Coaching Using the D3 Principles

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Industry Certifications

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coaching options for all experience levels

Personalized coaching
Gold level

Best for athletes who want 1-to-1 coaching, weekly feedback on training, and a monthly phone call of keep on track.
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Personalized coaching
Platinum level

Best for athletes who want unlimited support from their coach. 1-to-1 coaching, feedback on all key workouts.
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Personalized coaching
Platinum with mike

Limited availability to work directly with the Founder and Head Coach of D3, Mike Ricci.
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d3 affiliates, sponsors and partners

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let us help you with your triathlon training

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