What Shin Splints Actually Are
Medial tibial stress syndrome (MTSS) — the medical name for shin splints — is inflammation of the connective tissue between the shin bone and the muscles of the lower leg. It's caused by repetitive impact stress your tissues haven't yet adapted to, almost always from training volume that ramped up too fast.
The 10% Rule
Never increase your weekly running volume by more than 10% from one week to the next. If last week was 20 km, this week should be 22 km — not 30. Same applies to long-run distance. The body needs time to remodel bone, tendon, and connective tissue, which adapt slower than your cardio system.
Strengthen the Anterior Tibialis
The muscle on the front of your shin is what decelerates your foot when you land. Most runners have a weak one. Fix: 3 sets of 15 banded dorsiflexions (loop a band around your forefoot, pull toes toward your shin). Do it daily for 2 weeks. You'll feel the difference within 5 runs.
Stretch the Calves Hard
Tight calves pull on the same connective tissue that's already inflamed. Twice a day: 3 × 30 seconds wall calf stretch (knee straight) and 3 × 30 seconds with the knee bent (targets the soleus). Do it after every run while the muscles are warm.
Run on Softer Surfaces
Concrete is the worst surface for shin splints. Until they heal, run on grass, dirt trails, or a treadmill set to incline 1. The slight cushioning reduces tibial impact by 15-25%. Avoid downhill running entirely until pain is gone for at least 7 days.
When to See a Doctor
If pain persists for more than 3 weeks of conservative treatment, or if you have a tender spot the size of a dime that's painful even when you're not running, you may have a stress fracture. That requires imaging and 6-8 weeks of no impact. Don't 'run through' it.
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