Swingers Club: Tennis Tips for Beginners

Tennis Advice
by Oliver; 2015-01-10
     

Learning Tennis for Beginners

Here's a quick and dirty list of tennis pointers for beginners. I like the onion method of learning, where you start from the outer layer, learning the bare minimum, then go deeper. So here's the entire lesson boiled down into bullet points: if you want to read further, the rest this post expands on these points. Nothing's easier than dispensing advice from an armchair, but—this being the internet—that's exactly what I aim to do!

Spin

Imagine you're an archaeologist macheteing your way through the steamy jungles of South America. You stumble upon an ancient aboriginal tribe, lost to modern civilization, who worship spin. An implausible scenario? Well, in tennis, spin is worthy of worship; it's worthy of demonic rites; and it's worthy of human sacrifice. In other ball sports—say, basketball or volleyball—spin is a fact of physics but not indispensable to the game. Not so in tennis. Groundstrokes present a unique problem: the ball has to go up over the net but then drop down inside the baseline. This means, if you treat a tennis ball as a hitter in baseball would, and crank it, it's going to fly out: neither a fly ball nor a line drive has the right trajectory for a tennis court. So how do you hit a ball hard, yet ensure it stays in? Spin resolves this paradox. In a hard baseline rally, the ball describes arcs where it appears as though magnets are pulling the ball down at each end. As David Foster Wallace observed, "Extreme topspin is the hallmark of today’s power-baseline game."

Physics Interlude

The reason topspin makes a ball drop is called the Magnus Effect—there's a nice video on it here[1]. Observe the following figure from Wikipedia:

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(Image credit: from Wikipedia, modified for clarity)

This is topspin, produced when the ball is spinning head over heels in the direction of motion. In this figure, the ball is moving right as well as spinning right (clockwise). It feels the wind, or air resistance, pushing it in the opposite direction, left. At the top of the ball, the wind (air resistance) is in the opposite direction to the spin, but at the bottom of the ball, it's in the same direction. Again, Wikipedia:
... Since there is more air friction occurring on the top surface of the ball compared to the bottom, this differential causes a greater pressure to be applied on the top of the ball, resulting in the ball being pushed down.
The Encyclopedia Britannica has a good explanation of this effect:
A spinning object moving through a fluid departs from its straight path because of pressure differences that develop in the fluid as a result of velocity changes induced by the spinning body. The Magnus effect is a particular manifestation of Bernoulli’s theorem: fluid pressure decreases at points where the speed of the fluid increases. In the case of a ball spinning through the air, the turning ball drags some of the air around with it. Viewed from the position of the ball, the air is rushing by on all sides. The drag of the side of the ball turning into the air (into the direction the ball is traveling) retards the airflow, whereas on the other side the drag speeds up the airflow. Greater pressure on the side where the airflow is slowed down forces the ball in the direction of the low-pressure region on the opposite side, where a relative increase in airflow occurs.
There's a nice figure at schoolphysics, which succintly states, "Giving the ball 'top spin' will make it dip while 'back spin' will make it rise":

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(Image credit: schoolphysics)

And there's a really sexy illustration at COMSOL blog which illustrates sidespin:

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(Image credit: comsol.com)

In this illustration, the ball is moving forward and spinning counterclockwise in the plane. The Magnus effect is pushing it right. Sidespin is not relevant in tennis, but in soccer it's used to bend the ball (e.g., on a corner kick).



[1] One confusing thing about this video is that, in the tennis portion, it illustrates backspin (upward force) rather than topspin (downward force).

Back to Tennis

All this pedantry aside, you discover and internalize a feel for spin on the court without ever worrying about these scientific details. As we'll discuss below, you produce topspin naturally by hitting groundstrokes from down to up, and you produce backspin by slicing up to down. Let's crystallize this with a table:

StrokeSpinRacket MotionBall MotionFunction
groundstroketopspindown to upspins in the direction of motioncauses a (high) ball to drop (inside the baseline)
slicebackspinup to downspins opposite the direction of motioncauses a (low) ball to rise (over the net)

Finally, let's observe topspin in action. Here's a video of pro Grigor Dimitrov hitting groundstrokes in slow motion. Take note of the down-to-up "brushing" action and how high he can hit over the net and still get the ball to drop:

(Video credit: YouTube: Grigor Dimitrov Forehand & Backhand From The Back(Slow Motion))

And here's footage of Andy Murray, who also puts a lot of spin on the ball, at normal speed:

(Video credit: YouTube: Wimbledon Winner Andy Murray Practice From The Back 2012(HD))

(At 0:37, he slices the ball, employing backspin.)

The Tennis Racket

Before we get ahead of ourselves, how do you choose a tennis racket if you're just starting? First, here's the anatomy of a racket:

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(credit: image of Wilson Pro Staff from tennis-warehouse.com, modified)

One thing to be aware of is that head size is a trade off between power and control. Tennis-warehouse.com has a good discussion about this:
Power is directly related to head size - a larger head will provide more power than a smaller head, all other things being equal. A larger head also offers a larger hitting area and sweetspot, providing more forgiveness on off-center hits. Today’s racquets are offered in head sizes ranging from 85 to 135 square inches, with the most common being 95-110. These head sizes offer a compromise between power and control for many players. Generally speaking, a smaller racquet head appeals to more accomplished players seeking more control, while larger racquets appeal to beginning and intermediate players seeking more power and a larger sweetspot.
As the blurb says, more experienced players use smaller, heavier rackets because control is prized as the be-all and end-all. For head size, 100 square inches is perhaps a line of demarcation—go above it if you're a beginner and below it otherwise. Another important parameter is handle size. Err on the smaller side and you can always beef it up with overgrips.

Tip: use a vibration dampener on your racket head to suppress high frequency vibrations traveling to your arm. Here's a what a dampener looks like:

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(Image credit: Amazon)

Tip: use overgrip to keep your racket handle sticky. Overgrip looks like this:

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(Image credit: Amazon)

Footwork and Positioning

The key to footwork is proactively moving to the ball rather than the converse: keeping your feet planted and stretching to the ball. A good default court position is, naturally, in the center and near the baseline. What about body position? Look at the following still, taken from YouTube: Roger Federer Practice @ Cincy Open - Part 1:

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(Image credit: YouTube: Roger Federer Practice @ Cincy Open - Part 1)

This is sometimes called the Ready Position (it's related to the Split Step—a little jump taken when your opponent hits the ball—which you can read about here). Note the horse stance and gently bent knees. Also observe that Federer rests his nondominant hand on the "V" (or throat) of the racket. If you watch the linked video, you'll see him using this hand (his left) to change his grip as he hits differents shots (it's especially pronounced when he prepares for his one-handed backhand). Different shots have different grips—this is an important point!—and the most convenient way to adjust grips is to twist the racket with this hand. This is not something only Federer does. Many pros have the exact same ready position, even those who hit with two-handed backhands.

The Grip

The way you hold your racket—the grip—is intimately important because it's connected to the geometry of your racket face as you swing. There are good resources on the subject of grips here: Wikipedia has a clean picture of the racket handle with numbered bevels (shown for a right hander):

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(Image credit: Wikipedia)

And Busy Tennis Players painstakingly illustrates each grip. Here's the subset I like (again, shown for a right hander):
  • The Continental Grip
  • The Eastern Forehand Grip
  • The Semi-Western Forehand Grip
  • The Two-Handed Backhand Grip
  • The Eastern Backhand Grip
  • The Extreme Eastern Backhand Grip
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(Image credit: Busy Tennis Players)

No one counts bevels on the court—you know your grips by feel—but they're useful for taxonomy. Choose the set of grips that feels comfortable to you but know that, if you're doing something out of alignment with the rest of the tennis world, it will lead you astray. The most common mistake beginners make is not varying grips. And the second most common is to serve with a forehand grip rather than the Continental Grip (aka, the Hammer Grip). Foreshadowing our discussion of strokes, observe the following fact: if you think of the racket's butt cap as a clockface, where the continental grip represents 12:00, then the hand moves in the clockwise direction for forehand grips—putting more support under the racket—while it moves counterclockwise for one-handed backhand grips.

The Strokes

Four fundamental strokes to master first are:
  • the forehand groundstroke
  • the backhand groundstroke
  • the backhand slice
  • the serve (discussed in the following section)
Other strokes—the volley, the overhead smash, the lob, the drop shot, the forehand slice—don't come up as often. Let's use Novak Djokovic to illustrate each of the main non-serve strokes:

(Video credit: YouTube: *NOVAK DJOKOVIC* In (Slow Motion HD))

The Forehand Groundstroke

You can extract some pieces of "actionable intelligence" from this video. During the forehand set up, turn your body such that the shoulders become perpendicular to the net. Before you hit the ball, get your non-hitting hand out to serve as a guide (a little like aiming a telescopic sight to track the ball as it approaches you). Let's examine the form of the swing frame by frame:

image
(Image credit: YouTube: *NOVAK DJOKOVIC* In (Slow Motion HD))

It's useful to think of groundstrokes as a superposition of backward to forward motion (imparting forward momentum) as well as down to up motion (imparting spin). Also notice the racket traces a "windshield wiper" pattern—it starts pointing to our left and ends pointing to our right. This goes back to the grip and how the arm moves. A forehand grip (which, recall, has the gripping hand significantly clockwise of 12:00 on the butt cap for a righty) easily lends itself to the windshield wiper motion as the arm twists about its axis like so:

image

What's the takeaway? Remind yourself to get low and hit from down to up on your groundstrokes. And twist your arm to get a nice windshield wiper arc as you follow through.

Tip for Beginners: If the ball comes to you really low on the forehand side, the geometry of the situation will often force you to hit the ball with the proper form. Try to replicate this on balls that aren't low, too.

The Backhand Groundstroke

The backhand groundstroke features some of the same elements as the forehand, but it's harder. Like the forehand, you hit down to up and, like the forehand, you swivel your body perpendicular to the net in preparation for it (the other way this time). A major difference is the grip. You can choose to grip the racket with two hands (easier, majority choice) or one hand (harder, minority choice). Again, the grip is critical. If you're hitting a one handed backhand, you definitely want to use one of the Eastern backhand grips, which will feel funny at first but then intuitive. I'm in the process of trying to learn the one-hander, and I'll update this section if I ever master it. But I'm already hooked on the magnificent imperiousness of the gesture. The sweep of the arm makes me think of a king surveying his lands from a balcony or a wizard casting a lightening bolt in a video game.

The Backhand Slice

If you're running for a ball on the backhand side that's just out of reach or trying to scoop up a low ball before it hits the ground, the backhand slice is your shot. It's also your shot if you want to pitch your opponent a changeup or just don't feel like hitting a full-on groundstoke. The backhand slice is a funny shot because, contrary to the groundstroke, the racket moves from up to down and puts backspin on the ball. It's natural to hit the slice with a continental grip, which is the same grip you'd hold a sword with if you were slicing a watermelon in two. After you hit the ball, you can let both arms fly out like an umpire making a "safe" call (to continue this incessant stream of baseball metaphors).

The Serve

Mea culpa: my serve is rubbish. But here's what I've picked up about this complicated sequence so far. First, and most importantly, you want to use a continental grip. Much of the counterintuitive geometry of the swing stems from this fact. For starters, this grip means that the racket strings will face the net when your shoulders are perpendicular, rather than parallel, to the net. You hit the ball in a much more oblique fashion than you'd guess at first blush—don't turn to orient facing the net too soon, as the videos below warn. And another don't: don't try to import any of your groundstroke technique or grip into this shot. The serve is its own shot with its own unique identity. However, that said, it shares a common goal with the groundstroke—namely, you still want to brush up on the ball to get that precious spin.

Remember the problem we identified in the beginning of this article? There's a kind of paradox at the core of tennis—the contrary aims to get the ball over the net, but get it to drop inside the line. Recall the answer to this problem was topspin. Now with the serve, the net is still there, but the damn line is even closer. So it's the same problem magnified 10x. The answer? Again, it's spin, spin, spin. The more you spin the ball, the more license you give yourself to hit it harder (with a chance of it still going in).

I'm more comfortable letting the experts speak when it comes to serving. Here are some videos from Kevin Garlington at Total Tennis Domination and Tomaz Mencinger at Feel Tennis Instruction—each video as close as you're going to get, perhaps, to one brain dumping raw knowledge directly into another brain:

(Video credit: YouTube: Tennis Serve Lesson: Why You Should Use A Continental Grip If You Want A Better Serve)

(Video credit: YouTube: How To Serve In Tennis In 7 Steps)

(Video credit: YouTube: Why Is The Serve In Tennis So Difficult? One Main Reason...)

(Video credit: YouTube: Tennis Serve Pronation Exercise For Top Spin Serves)

(Video credit: YouTube: 6 Drills For Improving A Shallow Drop In A Tennis Serve)

(Video credit: YouTube: How to Correct The Waiter's Serve In Tennis)

(Video credit: YouTube: Tennis Serve Racquet Path - Linear vs Circular)

And, finally, this one from Ian at Essential Tennis deals with the misleading term "wrist snap":

(Video credit: YouTube: "Wrist Snap" Myth Busted - Tennis Serve Lesson - Tennis Serve Technique - Roger Federer Serve)

Keeping all we've just learned in mind, let's watch a video of Federer, one of the masters of serving:

(Video credit: YouTube: Roger Federer Serves in Slow Motion HD -- Indian Wells Pt. 08)

I love this video because it shows Federer progressing from lazy warm-up—first getting his fluid arm motion right—to full-fledged serve. It's a rare look at how you might approach learning to serve in a step-by-step fashion.

Tip: One nice, if obvious, point about the serve is that you can practice it without a partner. So no excuses if you want to improve your game while your friends are busy.

Conclusion

Never having been more up on my tennis theory, I went out for a lesson after I wrote this post. YouTubes of technical perfections danced in my head. Then I stepped on the court and blundered for an hour and a half, making a mockery of myself and dishonoring the game of tennis. It illustrates that all of the above information has to be in your muscle—rather than your intellectual—memory. But you already knew that. So... see you on the court?
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