“Easy endurance alone is enough to improve.”
The idea
Running or cycling a lot at an easy pace is enough to improve over every distance.
What research says
Among endurance athletes, the best results are often associated with an intensity distribution where most of the volume is easy, but with a real share of hard efforts. Seiler (2010) described this distribution, often called “polarised” or “80/20”, as a pattern observed in elite athletes, not as a universal rule.
What is still debated
Easy volume is the base, but on its own it is not enough to improve on shorter or more sustained efforts. Results vary by discipline, level and goal. The question is not choosing between easy and hard, but which proportion fits your goal and available time.
In Allure+
Allure+ plans do not rely on easy endurance alone: they alternate easy sessions with quality sessions.
Source : Seiler S. (2010). “What is best practice for training intensity and duration distribution in endurance athletes?”. International Journal of Sports Physiology and Performance, 5(3), 276-291.