My top tip for calf raises either seated or standing is to slow the f*** down. Too many people are just like bouncing here like this. And what happens when you're bouncing? It's just your Achilles tendon that just has all the recoil force. What you want to do is that you want to make sure that you're coming through a slow range of motion, and it's very controlled, the entire time pausing at the bottom to remove the elastic force of your Achilles tendon. And then when you hit the top, you want to make sure that you're pausing at the top, contracting your calf as much as you can.