I would recommend this to speed up the learning process and get more out of your time in the Practice hall.
Like with every ( New ) technique that one wants to learn or improve, it should start with slow shadow Practice where you deliberately focus on the correct move sequence in slow motion.
Once that works easily and well and gets bring, make the shadow Practice faster, at about 70-80% of the Real move speed.
Again focus on good Form and getting a good feel for the move in action.
Once that works well and becomes boring, Twist It up a little.
Do the same move at about 70-80% speed and imagine yourself actually practicing it, with balls coming at you and focus on the ball, like you would in reality.
The closer you can "feel" / imagine the Training hall, the environment, the table, your Partner and the incoming balls, the more effectively will it translate into actual Practice.
Follow the imaginary Ball with your eyes, as if it were really coming at you.
Once youre good and comfortable with that , do the same at close to 100% of the Real speed.
Focus on the imaginary, incoming Ball and Practice the movement until you think that you got it down.
This is not a replacement for actual Practice, but it is a huge boost in getting more out of limited Practice / table time with a Partner.
Kind of like a Training for Training.
The more you Do this, the better youll get at it.
Extras to make this even more effective.
The most important one:
1. Seeing the move, in Person or on Video,
2. and being able to watch the tape in your head.
And the next step of this:
3. Seeing yourself execute the move perfectly, purely by imagining it in your head.
As if you were a 3rd Person cameraman Recording yourself apply the move in a Real scenario.
These imaginary tools truly feel like a superpower.
Try it out for Some time and see how it can work in your favor.
And more:
Getting feedback
Having a mirror.
Recording yourself.
Robot / Return board practice
Shadow Practice combined with effective imaginary exercises have been a Real game changer for me.
Since I generally cannot get the Super high quality Training sessions 5 times a week that I would wish for, I figured out ways to get the most out of the resources I have.
This is one of them.
PS: Coach your training partner to train Looping underspin - the better he gets at it the better you will be able to train, im kinda doing something like that, im coaching the people in my club that are willing to put in the effort and time with my strategies and methods to improve and its working really well, Both for them and for me