Martijn Koster is using Runkeeper to track their running, walking and biking activities and you should too!

Martijn Koster
Member since September 02, 2010


calories burned 46


calories burned 338


calories burned 18,403

Join Martijn Koster on Runkeeper!

Sign up and join Martijn Koster today!

Sign Up With Email

Download Runkeeper

Runkeeper on the Apple App Store Runkeeper on the Google Play Store