Methodology
HRV and Training, Useful or Hype?
Francesco Zen, founder of ZTraining · Last updated June 20, 2026
Why this is more a longevity metric than a daily one
HRV is a real, useful signal, but it's the kind of detail that matters most in the deeper, longevity-focused work ZLIFE specialises in, rather than the week-to-week decisions standard coaching is built around.
What actually moves it
High intensity training, done consistently, has a real, positive effect on HRV over time, alongside building cardiorespiratory capacity. Sleep quality, recovery, stimulant intake, and mental stress all play a genuine role too, it's never just one input.
Related: Strength training for longevity · How much sleep for muscle and fat loss
Francesco Zen is the founder of ZTraining and ZLIFE, with 18 years of coaching experience working with executives across the UK, US, and UAE. He built Mr Z, an AI coach trained on his methodology to bring the same approach to a wider audience.