I'd focus on the lower body first.
You are leaking a lot of power with the racquet dropping before the leg push starts.
I don't like how the back leg kicks out to the right, that means his weight is going left, then he kind of falls into the court leaning over and catches himself on the right leg way into the court after he landed on the baseline. I'm also not in love with the initial foot position.
I wouldn't worry very much about the hand path or pronation/ISR right now, your son obviously understands how to hit a kick serve. His main obstacle is going to be getting loaded with the racquet tip still up and then driving everything in the same direction, getting it all behind the ball. I wouldn't be surprised if the timing of the pronation sorted itself out or at least improved dramatically once you got the lower body sorted.
If I were coaching him the first thing I would do would be quiet the lower body and have him serve with just his arm/upper body, then I would build in a pause at the trophy at full knee bend with the racquet up. Also make sure he can sink into that full knee bend, racquet up trophy position and hold it for 10 seconds, that will show that he is strong and balanced in his motion which will be a huge asset to the repeatability of the motion, consistency and accuracy.
Last, have him serve and land on his left foot and stay balanced on that one leg with his right still in the air, then from there he will be able to push back behind the baseline to hit the first ball, or push forward to the net.
The +1 is huge and a balanced landing and quick recovery will have him able to attack a weak reply or defend a strong one.
Good luck!
J
You are leaking a lot of power with the racquet dropping before the leg push starts.
I don't like how the back leg kicks out to the right, that means his weight is going left, then he kind of falls into the court leaning over and catches himself on the right leg way into the court after he landed on the baseline. I'm also not in love with the initial foot position.
I wouldn't worry very much about the hand path or pronation/ISR right now, your son obviously understands how to hit a kick serve. His main obstacle is going to be getting loaded with the racquet tip still up and then driving everything in the same direction, getting it all behind the ball. I wouldn't be surprised if the timing of the pronation sorted itself out or at least improved dramatically once you got the lower body sorted.
If I were coaching him the first thing I would do would be quiet the lower body and have him serve with just his arm/upper body, then I would build in a pause at the trophy at full knee bend with the racquet up. Also make sure he can sink into that full knee bend, racquet up trophy position and hold it for 10 seconds, that will show that he is strong and balanced in his motion which will be a huge asset to the repeatability of the motion, consistency and accuracy.
Last, have him serve and land on his left foot and stay balanced on that one leg with his right still in the air, then from there he will be able to push back behind the baseline to hit the first ball, or push forward to the net.
The +1 is huge and a balanced landing and quick recovery will have him able to attack a weak reply or defend a strong one.
Good luck!
J
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