u/SuperAnywhere9678

I’ve started doing Norwegian 4x4 intervals on an indoor treadmill (walking during the recovery intervals).

I’m mostly trying to understand the heart rate chart and whether this looks like the right intensity for the running intervals, or if I’m pushing too hard / not recovering enough between them.

I tracked this in FITIV, and from what I’ve read the target is usually around 85-95% of max HR during the hard intervals. Curious how others would interpret this chart.

Also is doing this once a week, with some other zone 2 work enough to grow my Vo2Max or should I be doing more? I'm also focused on strength training so it's been a bit of a balancing act of trying to do them all at once.