13/07/2026
EXTERNAL LOAD VS INTERNAL LOAD💥
Most runners are only looking at half the picture.
Distance, pace, elevation
These tell you what you did. They don’t tell you what it cost your body to do it. Two runs can look identical on paper and feel completely different physiologically, depending on your recovery, your stress levels, your sleep, where you are in your training cycle.
That gap, between what the data shows and what the body actually experienced, is where most overuse injuries quietly build. Not from one bad session. From weeks of external load looking fine while internal load tells a completely different story.
Start paying attention to both!
📚 Windt & Gabbett (2018); Williams et al. (2017, BJSM)