Juggling does help hand/eye but TBH don't see any more benefit to doing this than bouncing the ball on the racket.
I find a couple of issues with this method.
1. Cricket batting is more like covering a small strike zone in baseball that the ball is trying to hit. Tennis you have to move to the ball. Granted the service box narrows the coverage but the movement/footwork for positioning, with the tracking is what is required not trying to defend a designated strike zone.
2. Tracking is continuous. You said to stop tracking and start again after bounce. Once you stop tracking, you stop moving. Bad idea in tennis to stop moving if the ball is moving.
3. Don't look at where you want to hit the ball. You should already know what it looks like. Watch with the ball through your contact and follow it to its intended destination. You should already know where you want to hit the ball before you hit it.
Did you miss or dismiss my assertion that
peripheral vision is important in tennis? I mentioned that one of the primary benefits from learning to juggle is developing and trusting your peripheral vision while keeping your
head still and your
gaze fixed (on one point).
This can have significant implications for gaze control in tennis. Too many players have not learned to
trust their peripheral vision to keep track of things that are not the ball. Instead, they sneak a peek at the opponent(s), the court or their intended target area when they should be fixating on the ball or on their own contact point. Juggling can develop this trust in the role of peripheral vision to detect & keep track of the motion of the opponent(s) and partner as the ball gets closer to us.
While I disagree with much of your last post, I was going to say that I agree with point #
3. You should know where you are going to hit the ball before you hit it and you should not look at your target area -- you should be able to
visualize it. However, your comment that I put in bold puzzles me. You do
not watch the ball thru your contact because, in most cases, it is impossible to see -- our
smooth pursuit tracking system is incapable of seeing most balls at this close proximity.
Instead, it is better to fixate on the contact point, as Federer does, not the "invisible" ball. In fact, high speed video shows that his gaze jumps to the contact point shortly before the ball does. Furthermore, you should not try to follow the ball off the strings. Most of the time, the ball cannot be seen for several meters after it has left our strings. It is best to
keep the head still during the forward swing of the racket. Looking up and moving the head during the forward swing tends to adversely affect the swing path of the racquet. Take a close look at Federer and Nadal when hitting (in the back court). They do not look up to follow the ball until their swing is complete (or nearly complete). It is not necessary to see the ball before it crosses the net. If we look up to track the ball at the end of the forward swing, we should have ample time to see the ball cross the net and bounce on the opponent's side.
You two arguments against my proposed
tracking exercise don't make an sense either. While I do not play cricket, I know that it does not have a small strike zone -- a cricket batsman must deal with a large range of balls. Unlike baseball, they have more freedom to move. However, the fact that a tennis player must usually move to hit a ball is irrelevant to the issue at hand.
You assertion that once you stop tracking a ball, you stop moving is nonsense. You should be able to track a ball whether you are moving or not. Your assertion that tracking is continuous is not completely true either. Elite tennis player will often use a combination of
smooth pursuit tracking and catch-up
saccades in order to follow the ball. Once the ball gets in close proximity, the smooth pursuit system is incapable of tracking eh ball into the strings.
As I said before Federer's eyes actually get to the CP shortly before the ball does -- his eyes are lying in wait and his head is still. Agassi and others stop tracking the ball shortly before it gets to them and actually fix their gaze a little bit ahead of the CP (keeping the head still). They do not track the ball all the way into the strings and do not track the ball coming off the strings either -- visual tracking is not continuous.
Note that the tracking exercise that I proposed is just that -- an exercise. You should not dismiss this exercise out of hand. I strongly suggest that you try the exercise yourself for several days before passing judgment. If, after trying it for 3 days, you see no value in it then you can come back and criticize it. I've done this exercise myself and have found that it merit for me and others. I have only taught it to a few of my students so far. Results have been positive. It helps to develop visual tracking skills and, possibly even more important, it makes us more
aware of our ball tracking. It can also be useful to keep our gaze control fresh. Sometimes, when my poor aging eyes are fatigued are a couple of sets, my tracking becomes a bit slopp. I'll try this exercise on serve returns for a while. It helps to get me back on track.
Try to keep an open open mind to new/novel ideas such as this. I've been playing this game for nearly 40 years and have been teaching tennis since the early 1980s. I have revamped my game more than once in that 40 years as the technology and the style of hitting has evolved over the years. I keep myself completely open to new ideas to stay fresh and relevant in my teaching.
.