1. You'll be a more efficient runner.
2. You'll burn more calories.Adding more muscle will increase your metabolism, which means you'll burn more calories at rest and during workouts.
More: Ways to Boost Your Metabolism
3. You'll increase your endurance and reduce fatigue.Strength training helps your body better deal with the stresses of running. Your muscles will be able to perform longer before getting fatigued, which will help you maintain your proper running form.
4. You'll run faster.
More: How to Run Faster
5. You'll reduce your risk of injuries.
Lower body and core exercises are particularly important when it comes to reducing injury. Many running injuries, especially knee and hip-related issues, are a result of muscle imbalances or weaknesses.
6. Running will feel easier.
New runners frequently ask, "When will it start to feel easier?" The answer is different for everyone, but adding strength training to your routine can definitely speed up the process. Strengthening your leg muscles will help increase your endurance, meaning you can run longer without feeling fatigued.
More: When Does Running Get Easier?
Also see: Strengthening Workouts for Runners