A powerful serve is often associated with a strong arm. The biomechanics of the movement show something far more interesting: serve speed is the result of a coordinated sequence of movements of the whole body.
The legs create force against the ground, the body transfers it upwards through the hips and the trunk, the shoulder and the arm accelerate the racket, and the right timing lets the accumulated energy reach the ball.
So a faster serve does not simply mean “hit harder”. It means creating and transferring force more efficiently.
The serve is a kinetic chain
The tennis serve is one of the most complex movements in sport. Instead of separate body parts working independently, they take part in a sequential kinetic chain:
ground → legs → hips → trunk → shoulder → arm → racket → ball
The goal is not for every segment to move as fast as possible at the same time. They have to join in the right order.
The legs start the movement. The hips and the trunk continue the acceleration. After that the shoulder, the forearm and the racket can reach a much higher speed.
If one link in the chain is late or does not transfer the energy well, the following segments have to compensate. That is exactly why trying to produce more speed with the arm alone often has a limited result.
What does the research show?
A systematic review and meta-analysis published in Frontiers in Physiology analysed the effect of different strength & conditioning programmes on tennis serve speed. Out of 271 initially identified publications, 16 studies of sufficient quality were included in the quantitative analysis.
Classic strength training improves serve speed, but the effect is relatively small: resistance training – effect size ≈ 0.53. When training combines different physical qualities, the effect is larger: multimodal training – effect size ≈ 0.79.
For a faster serve it is not enough to simply become stronger. We have to learn to use strength quickly and in a coordinated way, in a movement related to the serve itself.
1. The legs are the beginning, not just support
In a good serve the legs are not a decorative movement before the strike. Bending the knees and the following extension let the player interact with the ground and start accelerating the body upwards.
There is an important distinction here: deeper knee flexion does not automatically mean a faster serve. A systematic meta-analysis of serve kinematics finds that the most frequently studied parameters in the trophy position are trunk inclination and front knee flexion. Science does not give one “magic” position that every player has to copy.
What matters more is how the position lets the player continue the movement. The legs have to create an impulse that the rest of the body can use.
2. Body rotation is the key link
After the legs comes one of the most important parts of the chain: the hips and the trunk. They connect the lower and the upper body. If the legs produce force but the trunk does not transfer it efficiently, much of the potential acceleration is lost.
That is why core exercises for tennis players should not be seen only as exercises for a “strong belly”. What matters more is the ability of the body to:
- stabilise;
- control rotation;
- accelerate rotation;
- transfer force between the lower and the upper body.
This is why rotational medicine-ball exercises have a far more direct link to tennis than many traditional isolated exercises.
3. The shoulder has to be both mobile and stable
In the phase before acceleration the racket reaches a low position behind the body while the shoulder goes through significant external rotation. A meta-analysis of 27 biomechanical studies reports an average of about 130° of shoulder external rotation at the racket-low-point position.
This does not mean a player should consciously try to reach a specific angle. On the contrary – it shows how demanding the serve is for the shoulder. A combination of mobility + stability + strength + timing is required.
So shoulder training should not target force production alone. The rotator cuff, the scapular stabilisers and movement control are part of the system.
4. Explosiveness matters more than absolute strength
Imagine two players. One can produce a very large force, but relatively slowly. The other produces slightly less maximum force, but extremely quickly. For the serve the second quality is especially important.
Contact with the ball happens after a fast sequence of movements and there is no time for maximum force to be built up gradually. That is why serve training should include exercises that develop fast force production: plyometrics, jumps, medicine-ball throws and explosive movements.
This is supported by a broader meta-analysis of neuromuscular training in tennis players – an analysis of 23 studies and 743 participants shows improvements not only in strength and power, but also in serve speed.
5. The medicine ball is a particularly suitable tool
The reason is not that the movement has to literally imitate the serve. Medicine-ball throws let the player train:
- force production from the legs;
- rotation;
- force transfer through the trunk;
- explosive movement;
- coordination between the segments.
In a study of competitive junior tennis players a six-week programme including core training, elastic resistance and medicine-ball exercises led to an improvement in serve speed. The combination matters more than a single isolated exercise.
6. More muscle does not automatically mean a faster serve
This is one of the most common mistakes in physical preparation. The player trains bench press, shoulder press, biceps, triceps… becomes stronger, but the serve barely changes.
The reason is simple: general strength and the specific ability to accelerate the racket are not the same quality. Strength creates physical potential. Technique and neuromuscular coordination determine how much of that potential can be used.
So the correct model is Strength → Power → Coordination → Transfer → Racket Speed, not “more muscle → faster serve”.
7. Technique remains the decisive factor
No fitness programme can compensate for serious technical problems. A player can increase leg strength, core strength and shoulder power, but if the sequence of the movement is disrupted, part of that force will never reach the racket.
This is exactly where biomechanics and physical preparation meet. Good technique lets force be transferred. Good physical preparation increases the force that can be transferred. The two should not be separated.
How to train practically for a faster serve
Strength
- squat variations;
- split squats;
- Romanian deadlift;
- rows and pulling movements;
- controlled pressing movements.
Explosiveness
- vertical jumps;
- lateral jumps;
- bounds;
- medicine-ball rotational throws;
- overhead medicine-ball throws.
Core and rotation
- Pallof press;
- cable rotations;
- medicine-ball throws;
- anti-rotation exercises.
Shoulder and scapula
- external rotation exercises;
- face pulls;
- scapular control;
- rotator-cuff strengthening.
And finally – the serve itself
The transfer has to be completed on court. Physical preparation creates potential. The serve turns that potential into a tennis skill.
Do not chase speed at the expense of control
A faster ball has little value if the first-serve percentage collapses. That is why speed has to be considered together with accuracy + consistency + placement + spin. The goal is not the fastest possible single serve, but a higher usable speed in a real match.
Conclusion
Science shows that serve speed can be improved through physical preparation. But the best approach is not simply more strength. The more effective model combines strength + explosiveness + rotation + stability + coordination + technique.
The serve is a system. The legs create the initial impulse. The hips and the trunk transfer it. The shoulder and the arm accelerate the racket. Technique determines whether that energy reaches the ball efficiently.
So instead of “How do I hit harder?” the more useful question is: “How do I transfer more of my body's force to the racket?”
Scientific sources
- Deng N, Soh KG, Xu F, Yang X. The effects of strength and conditioning interventions on serve speed in tennis players: a systematic review and meta-analysis. Frontiers in Physiology. DOI: 10.3389/fphys.2024.1469965. PubMed
- Jacquier-Bret J, Gorce P. Kinematics characteristics of key point of interest during tennis serve among tennis players: a systematic review and meta-analysis. Frontiers in Sports and Active Living. 2024;6:1432030. PubMed
- Brito AV, Afonso J, Silva G, Fernandez-Fernandez J, Fernandes RJ. Biophysical characterization of the tennis serve: A systematic scoping review with evidence gap map. Journal of Science and Medicine in Sport. 2024;27(2):125–140. PubMed
- Lambrich J, Muehlbauer T. Biomechanical analyses of different serve and groundstroke techniques in tennis: A systematic scoping review. PLOS ONE. 2023;18(8):e0290320.
- Brito AV, et al. Effect of a 6-week junior tennis conditioning program on service velocity. Journal of Sports Science & Medicine. 2013;12(3):490–498.