Use this information to gain a HUGE advantage over your opponent!
GREAT NEWS!! The S3 Formula is back! We are in the process of finalizing the “in-season” version of our program, which will keep you improving on the gains you achieved this summer! Stay tuned for more info on the release date, but in the meantime, check out our S3 Formula website here: http://hockeydevelopmentsystems.com
CLICK HERE for a JPEG of the Heart Rate Zone Chart