Give Away: Closing Midnight Sunday (BST) – HRV4Biofeedback

I’m looking at HRV4Biofeedback right now and have a spare iOS code to give away.

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What is HRV4 Biofeedback?

Details here: HRV4Biofeedback

My Usage

I’m using it for the next few weeks to see if some mindfulness minutes of breathing each day at my resonant breathing frequency can improve my HRV

What I’ve done so far: completed the test which has already determined my resonant breathing frequency which is the resting breaths per minute that maximises my HRV. Normally it’s about 6 per minute and mine came out as 5.5.

Resonant breathing should act as a positive stressor on HRV ie low HRV can be improved, at least acutely, with deep breathing (and any dose might do it). Learn more from the sciencey stuff, here

Last Updated on 25 January 2026 by the5krunner

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the5krunner

tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.