If you're serious about heart rate training, you absolutely have to get a heart rate strap.

Period.

Not only is there a much higher risk of inaccuracy when using the optical sensor on your watch while running, but the fact of the matter is that the watch sensor doesn't actually measure your heart rate!

A chest strap measures the electrical signals from your heart, aka your actual heart rate. And that right there should tell you everything you need to know about why a heart rate strap is far superior to the sensor on your watch.

Websites/articles cited in this video:

Garmin:
https://www.garmin.com/en-US/garmin-technology/health-science/heart-rate-monitoring/
https://www.garmin.com/en-US/p/780139

American College of Cardiology:
https://www.acc.org/about-acc/press-releases/2017/03/08/14/02/wrist-worn-heart-rate-monitors-less-accurate-than-standard-chest-strap

Journal of the American College of Cardiology:
https://www.jacc.org/doi/10.1016/S0735-1097%2822%2902981-3

Listen/subscribe to Diz Runs Radio wherever podcasts are freely distributed or at http://DizRuns.com

Win a Free Custom Training Plan (16 weeks) for the Race of Your Choice
http://dizruns.com/giveaway

Connect With Diz On Social Media
Twitter: http://twitter.com/dizruns
Facebook: http://dizruns.com/facebook
Instagram: http://instagram.com/dizruns

Ways to Support the Cause, Including Additional YouTube Content:

Affiliate Partners:
http://DizRuns.com/feetures
http://DizRuns.com/headsweats
http://DizRuns.com/tailwind
http://DizRuns.com/coffee
http://DizRuns.com/aminoco

Become a Patron:
http://patreon.com/dizruns