Originally Posted by LeeD
Just copy the server you like, forget the how's and why's, and post a vid.
Excellent post by LeeD.
What you "feel" isn't necessarily what you are doing. Rather than getting sidetracked into what you "feel", spend some time to adopt the correct movement patterns.
Use video to confirm and adjust your movement patterns to the model you are using and then you can focus on what the correct movement patterns "feel" like.
As to the original question, I'm not sure if the hitting model applies. When I'm hitting the hardest serves, I don't have a conscious notion of "hitting" but instead it feels relaxed. Now, this obviously isn't true, in the sense that muscles are tensing very rapidly, but it seems more like cracking a whip than muscling into a ball.