[Swizec]

> More and more studies have been indicating that even just a few minutes of intense exercise can outperform long/slow LISS type cardios.

For best results run fast and far. During my personal best marathon (3h 15min) my heart rate averaged in the 170 range

[Earw0rm]

How old were you at the time? Mid 40s here and can comfortably sustain low 150s, but burn out quick past 160.

[Swizec]

Mid 30s