well, the first trick he does is the Arm roll, the way you practice it is:
get the ball with your 2 hands, then let it roll on your strong arm, a good way to make it roll on your arm is to tilt your arm upwards, that will make the ball naturally roll down your arm, its also about balance, you have to learn how to balance the ball once it starts rolling on your arm, and the second part is where he lets it roll on to his back and then he lets it fall to continue juggling, the way you do that part is:
once the ball rolls to your shoulder, tilt your head forward a bit, to make a smoother are on which the ball can roll, and then just let it naturally roll across your back and fall down.
I like to do the 2 arm version of that trick, its a bit harder, but it looks nicer in my opinion
i do the 2 arm roll starting at 1:23
see how i tilt my arm upwards and tilt my head forward
hope that helped
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