Train for a First Half Marathon in 4 Months

Overuse injuries (shin splints, runner's knee) from increasing mileage too quickly.

Strictly follow the 10% rule (never increase total weekly mileage by more than 10%). Prioritize Step 4 (strength training).

Running 'easy' days too fast, leading to burnout and inability to hit paces on tempo days.

Use the 'talk test' on easy days—you should be able to speak in full sentences. If you can't, slow down.

Gastrointestinal distress on race day.

Golden rule: Nothing new on race day. Only use gels, hydration, and breakfasts you have successfully tested during Step 7.