IRON KNEE ACADEMY
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FLAG 1
THE TEST: You must be able to complete a 20-minute brisk walk AND dynamic movements (like lunges or step-ups) with zero pain.
FLAG 2
The <4/10 In-Run Rule
Pain isn’t always a stop sign; sometimes it is just data.
THE TEST: If minor discomfort pops up during a run, rate it on a scale of 1–10. If it stays under a 4/10 (or 2-3/10 if you have a high pain tolerance) and fades as you warm up, keep going.
THE GREEN FLAG: Mild, fading sensation means your tissue is adapting.
FLAG 3
The 24-Hour Recovery Window
The ultimate test of a run happens the next day.
THE TEST: Track how your knee feels exactly 24 hours after your run.
THE GREEN FLAG: If your pain settles back down to absolute 0 within 24 hours (12 hours is even better), your knee successfully tolerated that distance. You are clear to step up your mileage next time.
RED FLAGS
Here’s how we can fix this ↓