When people do strength training, the outer calf muscle grows more than the inner calf muscles, no matter how they lift weights. This shows that some muscles naturally grow faster than others.

Different types of muscle fibers in your calf muscles don't affect how much they grow from lifting heavy or light weights, because both the mostly slow-twitch and mixed fiber muscles grew about the same with both types of training.

If you're someone who regularly lifts weights, doing more triceps exercises each week might help your triceps muscles get a little bigger—but only a little, and not as much as it helps your biceps.