Andrew Galpin recommends incorporating maximal heart rate work, such as 90-second intervals at max heart rate followed by rest and repeats, into a training week.

“Dr. Andy Galpin was on this podcast recently, and he told me that the subtle zone 2 cardio and the weight training's great, but that I really should be doing some max heart rate work per week, going into max heart rate for 90 seconds, then resting and repeating that, maybe even mild repeats.”