When you lift weights, your calf muscles get bigger by about 6% to 20%, and that’s pretty much the same amount of growth you see in other muscles like your arms or thighs.

When you do strength training, your calf muscles grow just as much as your biceps and other arm muscles do — no bigger, no smaller.

Individual hypertrophic responses to resistance training are highly variable across muscle groups and are not consistently correlated between upper and lower body musculature.

When people lift weights regularly, their muscles usually get about 5% bigger on average, no matter what kind of weight routine they follow.

Individual hypertrophic responsiveness to resistance training exhibits moderate inter-muscle correlation, but a substantial proportion of variability is attributable to non-exercise-specific biological factors.

Even when you train one leg differently from the other, both legs tend to grow muscle in similar ways — which means your body’s natural biology, not the workout itself, is what really controls muscle growth.