1. Threshold runs – Sustained efforts at your “comfortably hard” pace. These build the aerobic engine you need to sustain 5K pace without collapsing. Usually 15–25 minutes at tempo pace.
   

2. Race-pace practice – You must spend time at actual 5K pace. Nothing replaces the feel of running the exact effort you’ll need on race day.
   

Here’s a little secret: the fastest runners aren’t the ones with the highest mileage—they’re the ones who hit their quality workouts consistently and recover properly.