Build Calluses, Not Blisters

Load management and gradual progression can feel a little abstract sometimes. One analogy I often use with patients is the difference between building calluses and developing blisters.

Blisters are pockets of fluid that form between layers of skin after sudden or excessive friction. Most people have experienced them from a new pair of shoes that rub until they’re broken in. They’re painful, limiting, and usually settle within a few days.

Calluses, on the other hand, develop gradually over time in response to repeated pressure and friction. They’re your body’s way of reinforcing an area to better tolerate stress.

The same thing can happen with training and activity. When we suddenly do too much, too soon, we often develop the equivalent of a blister. Our body isn’t prepared for the spike in stress, so pain flares up and we become limited for a few days. But when we progress gradually, we give the body time to adapt. Over time, we become stronger, more resilient, and more tolerant to the demands we place on ourselves. We build calluses instead of blisters.

It’s natural to want to progress quickly in sport and training. But most of the time, the better approach is to build calluses, not blisters. Avoid big spikes in activity, progress gradually, and give your body time to adapt. That’s usually what keeps people active, healthy, and moving forward long term.