THE SCIENCE OF STRETCHING FOR RUNNERS

By Coach Kamau Waweru Kamau

COACHES CORNER : THE SCIENCE OF STRETCHING FOR RUNNERS;

Should runners stretch before running?

The answer is: it depends on the type of stretching, the duration, and what you are about to do. The old approach of holding long static stretches immediately before a hard run is no longer considered the best default warm-up strategy.

But that doesn't mean static stretching is bad.

WHAT HAPPENS WITH STATIC STRETCHING? Static stretching involves holding a muscle at an extended length,typically for 20–60 seconds or longer. Long-duration static stretching immediately before explosive or high-intensity exercise can produce a temporary reduction in maximal force, power and muscle-tendon stiffness.

For a distance runner, this may matter particularly before:

• Intervals.
• Racing.
• Strides.

-Hill repetitions.

• Threshold sessions.

The effect is influenced by stretch duration and the subsequent activity. Shorter stretches generally have smaller effects than prolonged stretching. Therefore, the message shouldn't be:

"Never stretch before running." It should be: "Don't use prolonged static stretching as your primary preparation for a demanding running session."

THE BETTER PRE-RUN STRATEGY: WARM UP

Running itself is the main component of a running warm-up.

A progressive warm-up increases:

• Muscle temperature
• Blood flow
• Cardiovascular readiness
• Joint movement
• Neuromuscular activation
• Running-specific coordination

For an easy run, you may simply need to start slowly and progressively increase your pace.

For a quality workout, the preparation should be more structured.

EXAMPLE: QUALITY SESSION:

1. Easy running — 10–20 min Start comfortably and gradually increase intensity. 2. Dynamic mobility

Examples:

• Leg swings
• Walking lunges
• Ankle movements
• Hip mobility
• Controlled high knees

3. Running drills

Use drills when they have a specific purpose and are relevant to the session.

4. Strides

3–6 × 60–100 m progressively faster, with adequate recovery.

The objective is not to fatigue yourself.

The objective is to prepare the neuromuscular system for the intensity that follows.

• WHERE DOES STATIC STRETCHING FIT?

Static stretching can still be valuable. It is particularly useful when a runner has a specific flexibility limitation or wants to develop range of motion. The important distinction is when you do it. Consider: ✅ After an easy run. ✅ During a dedicated mobility/flexibility session. ✅ Away from key high-intensity workouts. If static stretching is necessary before exercise because of an individual mobility restriction, keep it relatively brief and follow it with dynamic movement and sport-specific activity.

WHAT ABOUT THE COOL-DOWN? After a hard workout, don't necessarily go from maximum effort to complete rest immediately. A 5–15 minute easy jog or walk provides a gradual transition toward resting intensity. But let's also correct another common misconception:

❌ "The cool-down removes lactic acid."

That's not the scientific explanation.

Lactate is rapidly cleared and recycled after exercise. The cool-down is better understood as a gradual transition from strenuous exercise to rest, while also providing an opportunity to reduce movement progressively and begin the recovery routine. And stretching during the cool-down? It is optional. You don't have to stretch after every run to prevent soreness or injury.

THE SCIENTIFIC RUNNER'S CHECKLIST:

BEFORE EASY RUN

➡️ Start easy. ➡️ Progress naturally.

BEFORE HARD RUN

➡️ Easy running. ➡️ Dynamic mobility. ➡️ Running-specific drills if appropriate. ➡️ Strides.

STATIC STRETCHING

➡️ Use strategically. ➡️ Develop flexibility when needed. ➡️ Avoid prolonged stretching immediately before maximal/high-intensity work.

AFTER RUN

➡️ Gradually reduce intensity ➡️ Easy jog/walk if appropriate ➡️ Mobility/stretching if it serves a specific purpose

THE BIGGER LESSON:

There is no single stretching protocol that every runner needs. Flexibility is not the same as running performance. A distance runner needs an appropriate combination of: Mobility + strength + stiffness control + coordination + elasticity + running-specific conditioning. The objective isn't to make the body as flexible as possible. The objective is to make it appropriately mobile and capable of producing and transferring force efficiently.

So before your next hard session:

Don't just stretch.

Prepare the system you're about to use.

WARM UP TO PERFORM. STRETCH WITH PURPOSE. COOL DOWN PROGRESSIVELY.

STAY HARD!

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