Building running-specific fitness is like building a pyramid. You have to start with a wide, solid base that can support the demands of the structure as it grows higher and higher. The stronger and wider the foundation, the better your performances will be at the peak.
Without a stable base? The pyramid is going to collapse into the sand—or in your case, result in injury, burn out, sickness, or a performance plateau. Thanks, but no.
The most efficient way to build your own, never-gonna-break-down pyramid is to train in your own heart rate zones. In all the Heart + Sole programs, you will test to find your own individual zones, and use those zones to guide your training.