Deliberate practice of hard efforts plays a big role in your training, but the most important factor is related to aerobic volume over time mixed with enough intensity to turn that base development into high performance.
As athletes, we like to focus on the hardest workouts. Well designed studies have highlighted a truth that incorporates physiology and applied studies and training theory into a helpful takeaway:
The sexy workouts may get the headlines, but the long-term grind makes the champions!