Guides · Tennis
How to increase racket-head speed in tennis, and how to measure it
More racket-head speed comes from swinging looser, not harder. The four mechanics that create it, the drills coaches use, and how to measure head speed so you know if it is working.
Short answer: To get more racket-head speed, swing looser, not harder. Speed comes from a relaxed grip and arm, a body that turns from the legs up, and a racket that trails your hand and then whips through contact. Train it with full-speed shadow swings and a few drills, and measure head speed the same way each time to see if it is working.
Racket-head speed is one result of the six tennis swing fundamentals every stroke shares. This guide takes that one result apart.
What racket-head speed is, and what it isn't
Racket-head speed is how fast the top of the racket is moving, usually quoted at contact, in km/h or mph. It is not ball speed. How fast the ball leaves depends on where on the strings you hit it, how heavy the racket is and how much spin you put on it. The speeds shown on TV are ball speeds.
It is also not effort. A tense swing often feels powerful and is slower than a loose one, because the muscles that squeeze the grip and brace the shoulder work against the ones that speed the racket up. And more is not always better: a swing you can't control is a swing that hits the fence. The target is your fastest relaxed swing that still lands the ball where you meant.
The four mechanics behind head speed
1. A loose grip and a relaxed arm
Tension in the hand, forearm and shoulder fights the racket. Hold it firmly enough that it can't twist, and no tighter. A cue many coaches use is grip pressure around three out of ten while the swing builds.
Loose does not mean limp. A lab study of one elite player hitting 50 topspin forehands per condition found that a firmer grip gave a higher average head speed than a normal grip (Christensen and colleagues, 2016). One player is a small sample, so treat it as a hint. It fits what many coaches teach: loose and free on the way to the ball, a firmer hand as the racket arrives.
2. The kinetic chain: the legs start it
In a fast stroke the speed is built from the ground up. The legs push, the hips turn, then the trunk, the shoulder, the upper arm, the forearm, the wrist and last the racket. Each link gets going as the one before it slows down, so speed is handed along from the big, slow parts of the body to the small, fast ones. Biomechanics research calls this sequence the kinetic chain (Elliott, British Journal of Sports Medicine, 2006).
The most common leak is an arm-only swing, where the hips and shoulders stay square and the arm does everything. Turn the hips and shoulders first, and let the arm be pulled round behind them. The stroke guides show the sequence for each shot: forehand, backhand and serve.
3. Lag and a whippy release
As the body rotates, a relaxed hand and wrist let the racket trail behind. Then the forearm turns over and the wrist lets go, and the racket head passes the hand just before contact. That trailing and catching up is the whip, and it is where much of the final speed comes from.
You can't pose lag or hold it with a stiff wrist. It is what a relaxed arm does when the body accelerates. On the serve it shows up as the racket drop, which the serve guide covers.
4. Swing through the ball, not at it
If you aim the swing at the ball, you slow down as you arrive. Aim at a point well past contact and let the head keep accelerating through the hitting zone. The finish is the proof: a fast, relaxed stroke ends high and wraps around, and a stroke that was braked at the ball stops short.
Drills that build head speed
These are the drills coaches commonly prescribe. We haven't found trials showing that each one adds speed by itself, which is a good reason to measure your own swings (see how to measure it). Warm up first, clear the space, and stop if a shoulder or elbow hurts.
Full-speed shadow swings
The base drill: whole strokes with no ball, at the speed you want on court, one stroke per set so the shape stays clean. The shadow swing guide has the drills stroke by stroke.
Cue: listen for the whoosh. It should come late, around where contact would be. An early whoosh means you sped up too soon.
The towel drill
Hold a hand towel by one end and swing it like your stroke. A loose arm makes the far end snap. A tight arm just drags it. It is a drill for feeling the release, not a way to prove you got faster.
Cue: make the snap land in front of your front hip, where contact would be.
Overspeed swings
Swing something lighter than your racket, such as a flexible training stick or a light junior racket, as fast as you can while staying loose. The idea is to practice moving quicker than usual. The serve study in the next section found that a lighter racket gave faster head speed, which is the same principle. Keep the sets short and build up slowly, because fast swings with a light implement can load the shoulder.
Cue: if you tense up to go faster, you've gone too far. Back off until it is loose again.
Medicine-ball rotations
Stand side-on a few feet from a sturdy wall, hold a light medicine ball at hip height, then turn from the legs and hips and throw it at the wall. It trains the hips and trunk to start the chain, which is the first link most players skip. Pick a ball you can throw fast. Speed matters more than load.
Cue: hips first, arms last. If your arms throw it, the ball is too heavy or you didn't turn.
Big foam balls on court
A real-ball option from a 2010 Tennis.com tip: oversize foam transition balls travel slower, so you can swing faster and freer without worrying about hitting long.
Cue: swing out, not down. The big ball makes hitting long hard, so you can let go.
Does the racket matter?
Some. In a lab study of the tennis serve, lowering a racket's inertia raised head speed, and the results pointed to about a 10% rise in head speed for a 12% drop in inertia (Loughborough University). That was a simulated change with a small group of skilled players. A lighter racket can also feel less stable at contact. Gear will not fix a tense swing, so work on the mechanics first and try a demo racket before you switch.
How to measure racket-head speed
We make ShadowSwing. It is listed below next to other ways to measure, and everything said about other products comes from their own listing or from the sources at the end, checked on 21 October 2026.
Head speed is hard to judge by eye, so a number helps. Every method gives an estimate, and the methods don't agree with each other, so choose one and compare yourself with yourself.
| Method | How it works | Good for | The catch |
|---|---|---|---|
| Lab motion capture or high-speed video | Cameras track the racket at hundreds or thousands of frames a second; one serve study used 400 and 4,500 Hz | Research-grade accuracy | A lab and an expert, not a weekday session |
| Sensor on the grip or racket | An accelerometer and gyroscope at the grip; head speed worked out from the grip's motion (one patent describes this) | Real swings with a real racket, ball included | A device to buy and fit, and head speed is calculated from grip motion, not read directly |
| Radar | Measures the speed of whatever it is aimed at | Quick readings | Check in its own spec whether it reads the racket or the ball, and how to aim it |
| Smartwatch app | The watch on your hitting arm measures wrist motion; MyPowerTennis (Apple Watch) turns it into a head speed estimate | Real strokes, no camera | Estimated from wrist motion, and it depends on the watch you own |
| Phone swing trainer | ShadowSwing Pro works out head speed from how the phone moves in your hand | Shadow swings anywhere, no ball | You swing a phone, not your racket |
Slow-motion video is the other common tool. It shows the shape of the swing, and whether you get a number out of it depends on the app. For the trade-offs between a camera and a phone swing trainer, see do you need a camera to practice your swing at home?
Apple Watch: MyPowerTennis
As of 21 October 2026, MyPowerTennis is an Apple Watch app with an iPhone or iPad companion, from the developer Software Beinhofer. Its App Store listing says it measures racket-head speed and wrist speed in km/h or mph, and that the head speed is an estimate based on a racket radius you set, within about 10 to 20 percent. It needs an Apple Watch Series 6 or SE (2nd generation) or newer with watchOS 11, and costs €6.99 once, with no subscription, per the listing. It was released on 14 October 2026, and we found it listed in the Austrian, German and Swiss App Stores only. It is not on Android. See the App Store listing.
ShadowSwing Pro
Hold your phone like the grip and swing. With Pro, ShadowSwing shows racket-head speed on every swing, in km/h or mph, and keeps a speed trend. It is an estimate worked out from how the phone moves, so use it to compare your own swings with each other, not with a radar or another app. It measures the swing only. It doesn't track the ball, your body or spin, and you are swinging a phone, not your racket. It is on iPhone and Android.
What to do with the number
- Test the same way each time. Same method, same warm-up, same stroke, and take the average of ten swings as well as the best one.
- Change one thing at a time. A looser grip one week, a hip turn the next, so you know what moved the number.
- Don't chase the top number. If speed goes up and the ball goes everywhere, or a shoulder complains, you haven't gained anything.
- Skip the comparisons. A figure from one device can't be compared with a figure from another, or with someone else's.
Typical speeds. We don't quote typical or pro head speeds. The numbers online mix ball speed and head speed, different strokes and different measuring methods, and the studies we found were small. Your own trend is the useful number.
For what each training app measures, and what it can't, see the best tennis training apps.
Sources
Checked 21 October 2026.
- J. Christensen, J. Rasmussen, B. Halkon and S. Koike, a methodology for relating grip size and grip pressure to racket head speed in the tennis forehand, Procedia Engineering 147 (2016): doi.org/10.1016/j.proeng.2016.06.317
- Loughborough University, head speed against racket inertia in the tennis serve: PDF
- B. Elliott, biomechanics and tennis, British Journal of Sports Medicine (2006), on the kinetic chain: PubMed Central
- Tennis.com, a tip to increase your racquet head speed (2010): article
- US patent 9327177, tennis swing analysis method (sensor at the grip): Google Patents
- Tennis Warehouse University, racquet power (head speed from rotation rate and radius): article
- MyPowerTennis, App Store listing: apps.apple.com
Questions
How do I increase my racket head speed in tennis?
Relax your grip and arm, turn your hips and trunk before your arm so the racket trails behind your hand, then let it whip through contact and finish well past the ball. Full-speed shadow swings and a few drills help. Measure head speed the same way each time to see whether it is working.
What is a good racket head speed in tennis?
There is no single good number. Published figures depend on the stroke, the player and how the speed was measured, and the speeds you see on TV are ball speed, not racket-head speed. Pick one way to measure, record your own swings, and aim to raise your own average without losing control of the ball.
How do I measure my racket head speed?
Options are lab motion capture or high-speed video, a sensor on the grip, radar, a smartwatch app and a phone swing trainer. Whatever you use, the figure is an estimate. Stick to one method, the same warm-up and the same stroke, and compare your swings with each other, not with numbers from another device.
Does a looser grip give more racket head speed?
Usually, because a tense forearm slows the racket. But loose does not mean limp. One lab study of a single elite player found a firmer grip raised average head speed, so many coaches teach loose on the way and firmer at contact. Treat that study as a hint, not a rule.
Do towel and whippy-stick drills increase swing speed?
They teach the feel of a loose arm and a late release, which is the skill behind speed. We have not found trials showing they add miles per hour on their own, so check your own numbers. Use clear space, warm up first, and stop if your shoulder or elbow hurts.
Does a lighter racket increase head speed?
Possibly. A lab study of the serve found about 10% more head speed for a 12% drop in racket inertia, though the change was simulated and the group small. A lighter racket can also feel less stable at contact, so demo one before you switch and keep working on technique.
Can an app measure racket head speed accurately?
As an estimate. MyPowerTennis, an Apple Watch app, says its head speed is an estimate within 10 to 20 percent. ShadowSwing Pro works out head speed from how your phone moves, best for comparing your own swings. Neither measures the ball. For lab-grade precision you need lab equipment.