Free Critical Speed & Training Zone Calculator Downloaded a marathon, half marathon, or triathlon plan but not sure what the zones actually mean for you?This free calculator helps you turn your own field-test results into practical training pace estimates, so you can stop guessing your easy runs, threshold work, and harder sessions. Email Address Submit You’ll also receive practical running and triathlon training emails from The Distance Dr. You can unsubscribe anytime. Thank you! Please remember to check your junk/spam. Good luck with your training.
