Long Island Triathlon Coaching

Runners Edge
Triathlon training


Whether you want to try your first sprint triathlon or qualify for Kona, we have the custom triathlon training plan for you. Click Here!

Running Training


Customized training plans for any distance, from 5K to marathon and everything in between. Click Here!

Swimming Training


Private swim lessons by Danielle Sullivan for technique analysis, or group training sessions. Click Here!

Cycling Training


Power-based training for triathlon or cycling to help you reach the next level in your training. Click Here!

Extreme Training

Extreme Racing

We have experience training athletes for the toughest extreme races, from ultra marathons to obstacle course racing. Click Here!

General Fitness Training

General Fitness

If you are looking to get in shape or to stay fit, we have customized training plans to keep you motivated as well as looking and feeling your best. Click Here!

A Message From Danielle

Danielle Sullivan
Iron Fit Endurance is a Long Island based triathlon coaching program that provides a holistic approach to triathlon training that fits into your daily lifestyle no matter how hectic it may be.  Danielle Sullivan, Professional Triathlete and head coach, develops weekly custom training plans that accommodate every individual regardless of experience or ability. With over 23 years of triathlon racing and coaching experience and over 6 years racing as a Professional Triathlete, Danielle Sullivan has the experience and passion to help you reach your goals and beyond!