Watch a fast athlete explode off the line.
The first step looks violent. Their body shoots forward, their feet attack the ground, and within a few strides they have created separation.
Now watch that same type of athlete change direction. They sprint, slam on the brakes, plant, and accelerate the opposite way almost instantly.
We usually describe athletes like this as quick, fast, or explosive.
But underneath all of those qualities is something that sometimes gets overlooked:
Strength.
Strength training isn’t just about lifting heavier weights or building bigger muscles. Done correctly, it gives athletes the ability to produce, absorb, and redirect more force.
And those abilities are at the heart of acceleration and change of direction.
Acceleration Is a Force Problem
Acceleration is not the same thing as top speed.
Top speed is how fast an athlete can eventually run. Acceleration is how quickly they can get fast.
In many sports, acceleration matters more because athletes rarely have enough space to reach their true maximum speed. A shortstop attacking a ground ball, a linebacker closing on a running back, or a volleyball player moving toward a ball may only have a few steps to get there.
Those first few steps matter.
From a physics standpoint, acceleration requires force. The harder and more effectively an athlete can push into the ground, the greater their potential to propel their body in the opposite direction.
Think about pushing a heavy sled.
If you barely push against it, it barely moves.
Push harder, and it accelerates.
Your body operates under the same basic principle.
Strength training increases an athlete’s ability to produce force through movements like:
- Squats
- Deadlift variations
- Split squats
- Lunges
- Step-ups
- Hip extension exercises
As athletes become stronger, they increase the size of the engine they have available when sprinting.
Research in athletes supports this relationship. Strength training has been shown to improve sprint and change-of-direction performance, including improvements in short-distance acceleration.
But there is an important distinction.
Being strong doesn’t automatically make someone fast.
An athlete still needs to learn how to apply that strength quickly and in the correct direction. That is why a complete performance program should combine strength training with sprinting, jumping, plyometrics, and acceleration work.
Strength builds the engine.
Speed training teaches the athlete how to use it.
Agility Requires More Than Moving Your Feet Quickly
When many athletes think about agility training, they picture cones, ladders, and fast feet.
But changing direction isn’t just about how quickly someone can move their feet.
First, they have to stop their body.
Imagine a basketball player sprinting toward the baseline before cutting hard back toward the middle.
Before that athlete can explode in the new direction, they must rapidly reduce their existing momentum.
That requires strength.
The muscles of the hips, legs, and trunk must absorb huge forces as the athlete decelerates. The athlete then has to transition almost immediately from absorbing force to producing it again in a new direction. Effective change of direction therefore depends on both braking and propulsive abilities.
A simple way to think about it is:
Brake → Plant → Push
A stronger athlete potentially becomes better equipped for every part of that sequence.
Strength training can improve the athlete’s ability to control their body while decelerating and create the force necessary to accelerate again.
That becomes especially important during aggressive cuts where an athlete must significantly change direction.
Recent research in adolescent team-sport athletes has also highlighted the value of eccentric strength, the ability to produce force while muscles are lengthening, for improving change-of-direction performance.
That means exercises that build control and strength while lowering, landing, and decelerating can be extremely valuable.
Relative Strength Matters
There is another important piece of the puzzle.
Athletes don’t simply need to become stronger. They need to become stronger relative to their body weight.
Imagine two athletes who both weigh 170 pounds.
Athlete A can produce significantly more force than Athlete B.
When both athletes have to accelerate the same amount of body mass, Athlete A has a larger force-producing capacity available.
That doesn’t guarantee Athlete A will be faster. Sprint mechanics, coordination, reaction ability, tendon qualities, and many other factors matter.
But it gives Athlete A a greater physical foundation to work from.
This is why blindly adding muscle isn’t necessarily the goal for athletes. If body weight increases without a corresponding increase in force-producing ability, that additional mass may not improve acceleration.
The goal is to develop athletes who are strong, powerful, and capable of moving their own body extremely well.
Strength Is the Foundation, Not the Entire House
Strength training should not replace sprinting or agility work.
It should support them.
True agility also includes an athlete’s ability to react to what is happening around them. A defensive back isn’t running through a memorized cone drill during a game. They are reading another athlete, processing information, reacting, braking, and accelerating again.
That skill has to be practiced.
The same is true for sprinting. An athlete needs actual exposure to high-quality acceleration work to learn how to direct force into the ground efficiently.
Research suggests that combining strength with sport-specific speed, plyometric, and change-of-direction training can be particularly valuable rather than expecting traditional lifting alone to solve every problem.
A well-rounded athletic development program should therefore train athletes to:
- Produce force through strength training.
- Produce force quickly through explosive training and plyometrics.
- Apply force in the right direction through sprint and acceleration training.
- Absorb force through landing and deceleration work.
- Redirect force through change-of-direction training.
- React to the game through reactive agility drills.
That combination is where strength begins turning into athletic performance.
Stronger Athletes Have More Tools to Work With
If an athlete continually loses the first three steps of a race or struggles to slam on the brakes and explode in another direction, running more cone drills may not solve the entire problem.
They may simply need a bigger physical foundation.
Strength gives athletes the ability to put more force into the ground, control their body when stopping, and produce force again when accelerating.
The goal isn’t to create athletes who are good at lifting weights. The goal is to use the weight room to create athletes who are better at their sport.
A helpful place to start is simple: don’t judge athletic development by weight-room numbers alone.
Track what actually matters.
Measure an athlete’s 10-yard sprint, vertical jump, broad jump, and change-of-direction speed over time. If strength is increasing while those numbers are improving too, you’re not just building a stronger athlete.
You’re building a more explosive one.
