Originally Posted by
terrymorse
So, according to Coggan, mitochondrial production is equally sub-optimal at zones 2 (endurance) and 5 (VO2max), and if your goal is to increase mitochondria, you should be doing more levels 3 and 4.
I'll check out the check list. As always, it's a made more complex by Coggan's Z2 not being the same as ISM's Z2. 7 level / 6 level etc. ISM's Z2 may have things in common with Coggan's Z3