Methodology
HRV and Training, Useful or Hype?
Francesco Zen, founder of ZTraining · Last updated 20 June 2026
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
He built Mr Z, an AI coach trained on his methodology to bring the same approach to a wider audience.