My name is Sung, and I am a software engineer living in Bentonville, AR. I made this website as a tool to help you create fartlek and interval running workouts. I found these training methods very useful in improving my race time and Vo2 max. I believe that this website will provide value if you train with a group or use a Garmin smartwatch.

For a monthly subscription of $7.77, you receive these features:

• Train together- Create and manage public groups, and join private groups
• Send programmed workouts to a Garmin watch, and share programs with other people in the group

Even if you don't pay for a subscription, you can still access these features:

• A powerful programming tool to help you design workouts
• Participate in public groups
• Manage your own workout library
• Use our pace manager to help you achieve your goals

There are no ads, and there is nothing to download. Do it all from your browser.