Back in January, I did a post “Battle of Heart Rate Training”. I talk a little about my client/athlete Sarah how all her workouts would have high heart rate Zones 3-4-5. 3 weeks ago, she ran 5.5 miles at the usual pace. But what she noticed, her average heart rate dropped 15 beats and the run felt easier. Since January, the majority of her training has been in heart rate Zones 1-2. Zones 1 (easy) and 2 (endurance) which are critical for endurance training. As she changes her focus to Boston Marathon, she will find the training easier as the distance gets longer. Another training benefit of Zone 1 – 2, your resting heart drops because you are getting stronger. Be safe and healthy!
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Gear Up For Fitness 
I would like to know how you and her managed this. My runs are almost always in zones 3,4 and 5 even allowing for heat and other factors
Good question which I will talk about in another post this week😎