no no
the wall is your friend...
you can feed yourself any kind of ball you are having trouble with, specially the soft floaters or balls on the rise!!!
Experiment, i use the wall whenever my timing is off on the rising ball... just dont be lazy, and move to the ball!!
dont hit to the wall over and over and over...
feed yourself the ball you want to work with, hit it with proper technique, and then grab the ball, and feed it again to yourself...
its like if someone else sends you those balls...
in the case of hiting on the rise, the ball has force going upward, if you hit it with the raquet face perpendicular to the ground the ball will rise to the same height it would have rised if you didnt hit it... so you have to close the raquetface and feel the angle the ball leaves your raquet. also, its good to differentiate between balls below net level, and above net level, when hitting on the rise, the balls above this level dont need to have a loopy trajectory up, they will pass the net if the trajectory is almost level to the ground, there is no need to hit up, but FORWARD and let gravity do the work, and since you are hitting forward, there will be top spin on the ball since you will be hitting from above and with top spin relative to the flying path of the ball...