“HEART”Y stuff

Written by Michael E Dehn

Founder and CEO of Metro Pulse a continually running enterprise since May 1980.

June 14, 2025

VO2 max is the single most important predictor of longevity.

And the best way to maximise it?

A 25-minute workout that can make your heart 20 YEARS younger!

(The 4×4 Norwegian protocol) 🧵 pic.twitter.com/kMmzSdpnxd
— SammyArmstrong (@SammyRArmstrong) June 14, 2025