Turning your toes outward while doing calf exercises makes the Achilles tendon sit at a shorter resting length compared to turning them inward. This means the way you position your feet horizontally can change the tendon's natural shape before you even start moving, which might affect how weight is distributed when you walk or run.

When you push off with your feet during exercise, turning your toes inward instead of outward changes how your Achilles tendon stretches and slides inside your leg. This shift in foot position might change the internal pressure and sliding forces on the tendon during hard movements.

Changing the direction your toes point while doing a calf exercise changes how much different parts of your calf tendon stretch. Pointing your toes outward stretches the inner part of the tendon more, while pointing them inward stretches the outer part more.

How you point your feet when pushing off the ground changes how your calf muscles work together and affects how your Achilles tendon stretches. This shows that your foot angle directly influences the connection between your muscles and tendons.

Changing the direction you point your toes while doing calf raises changes which part of your calf muscle gets the most work. Pointing your toes out targets the inner calf, while pointing them in targets the outer calf.