The Stretch Zone: Why Making Things Hard Improves Performance

By Shannon Kasun, Neuroscience Specialist

Physical gains are often achieved by pushing your body slightly beyond its current capabilities. To get faster, you run quicker than your legs are comfortable with. To become more flexible, you stretch past your usual range of motion. To get stronger, you lift weights heavier than what your muscles are accustomed to. It is uncomfortable and leaves you sore, but it is one of the most effective ways to drive physiological adaptation.

The brain operates on a similar principle.

Cognitive performance improves most when you work at the edge of your current ability. Bjork and Bjork (2011) describe this as introducing “desirable difficulties,” or intentionally making learning and practice more effortful in ways that ultimately enhance performance. In other words, making things harder in a “good way” is what drives cognitive improvement (Bjork & Bjork, 2011). This is what we can define as the Stretch Zone.

The Stretch Zone: Where Learning Occurs

The Stretch Zone sits between two ineffective extremes. On one side is the Comfort Zone, where tasks are familiar and require little effort, resulting in minimal adaptation or growth. On the other is the Panic Zone, where demands exceed capacity, leading to stress, disengagement, and impaired learning. The Stretch Zone represents the middle ground: tasks are novel, effortful, and attentionally demanding, but still within reach.

A clear example of the Stretch Zone in practice is active recall. Unlike passive review, active recall forces the brain to retrieve information rather than simply recognize it. This process is inherently more effortful—it often feels slower, less natural, and more uncomfortable because you are actively searching for the answer instead of being given it. However, this difficulty is precisely what makes it effective. Research shows that actively retrieving information leads to significantly better long-term retention compared to repeated studying (Roediger & Butler, 2011). By repeatedly engaging in this effortful retrieval, you develop and strengthen the neural pathways associated with that information, making future access more efficient. In this way, active recall sits squarely within the Stretch Zone: it is challenging enough to drive meaningful learning, but not so difficult that it becomes overwhelming.

Another example of the Stretch Zone in practice is seen in musicians. Rather than always practicing at a comfortable pace, musicians often rehearse pieces at a faster tempo than they can reliably perform. This introduces a level of difficulty that exceeds their current mental and physical ability, forcing greater precision, timing, and coordination. Mistakes become more frequent, but this is intentional—the increased demand exposes weaknesses in technique and timing that might go unnoticed at slower speeds. By training under these more challenging conditions, the nervous system is pushed to adapt. When the musician returns to a normal tempo, the piece feels more controlled and manageable, as the underlying skills have been strengthened. This approach reflects the same principle seen in other domains: by briefly operating beyond your comfort zone, you improve your capacity within it.

Operating in the Stretch Zone is characterized by effortful focus, frequent errors, and mental fatigue. These are not signs of failure—they are indicators that the task is appropriately challenging. In fact, research shows that errors, when followed by corrective feedback, can actually enhance learning and performance (Metcalfe, 2017).

The Cycle of Continuous Adaptation and Gains

The key takeaway is straightforward: gains require challenge. Whether you are training your body or your brain, adaptation occurs when you operate just beyond your current level. Tasks that feel easy will maintain your abilities, but they will not meaningfully improve them.

Living in the Stretch Zone means deliberately seeking out that edge, choosing tasks that require effort, embracing discomfort, and allowing room for mistakes. Over time, your brain adapts, and what once required effort becomes automatic, shifting the boundary forward. Continued growth then requires stepping just beyond it again and re-entering this zone of optimal challenge. The Stretch Zone represents a continuous cycle of growth, where each challenge drives adaptation, and each adaptation expands your capacity, elevating your performance over time.

Live in the Stretch Zone.

References 

Bjork, E. L., & Bjork, R. A. (2011). Making things hard on yourself, but in a good way: Creating desirable difficulties to enhance learning. In M. A. Gernsbacher, R. W. Pew, L. M. Hough, & J. R. Pomerantz (Eds.), Psychology and the real world: Essays illustrating fundamental contributions to society (pp. 56–64). Worth Publishers.

Roediger, H., & Butler, A. The critical role of retrieval practice in long-term retention. Trends in cognitive sciences vol. 15,1 (2011): 20-7. doi:10.1016/j.tics.2010.09.003

Metcalfe, J. (2017). Learning from errors. Annual Review of Psychology, 68, 465–489. https://doi.org/10.1146/annurev-psych-010416-044022