Do you train by data ie heart rate zones vs “by feel” ie rating of perceived exertion? Or both? Or do you just go as hard as you can each time you workout?

If you wanna have longevity with regard to running, cycling or swimming ie keep doing these things for a VERY long time....it makes sense to do most of your training (80%) in zone 2 or low intensity. Only 20% of your trining should be in the moderate to high intensity zones...

Train easier to race faster! Consider the fact that 80% of runners get injured every year and a vast majority of these injuries are preventable by training properly with correct intensities at different stages of fitness.

Have you given much thought to your training intensity? Looking at the table here, what zone or RPE do you think you usually workout in?