I have been "modifying" my serve a little in the past weeks. I had a slight knee injury and when I came back my serve was a piece of crap so I am revamping it I guess.
I know from these videos that I need to toss the ball more out and to the right because I have the tendency to toss the ball too the left which makes me off balance.
Before my injury I had a really good serve for my age .. on a good day I would probably max out at like 115mph. On my back swing, the racquet face would be facing up instead of my hand being on top of the racquet. I have fixed this to an extent but its a work in progress. I am not swinging as hard as I usually do in the video because I was focusing on technique - not power
heres the link:
and yes, I know I have a bad farmers tan