Release Left-Hand Tension on Clarinet: Master Thumb and Index Finger Technique to Prevent Tendonitis
- Mar 31
- 5 min read
Left-Hand Tension on Clarinet
Fujiyama Clarinet Studio is located in Yanai, Yamaguchi Prefecture.
In lessons, one of the most common concerns I hear is: “My left hand feels tight,” or “My left hand locks up and my fingers won’t move.”
The cause is often not sheer finger strength, but the way the supporting finger (the thumb) and the moving finger (the index finger) fail to work together. That mismatch creates unnecessary tension in the entire left hand.
In this article, I’ll clarify the roles of the left thumb and left index finger, and summarize key points for building a left hand that can move smoothly without strain.
The left thumb “rests” — stay stable so you can move
On the clarinet, the left thumb plays the important role of opening and closing the register key.
If too much force goes into the thumb, it not only interferes with the other fingers, but also concentrates strain at the base of the thumb and can lead to tendonitis.
The ideal state is: stable and secure, yet nothing is locked up.
The left index finger “rolls up” — moving to the A and G♯ keys
Now let’s look at the index finger. The left index finger often requires a special kind of motion on the clarinet, because it frequently needs to move to the A key or the G♯ key—something that can’t be handled by simple up-and-down movement alone.
If you watch in the video, you’ll notice an important point: the whole left hand works as if turning a doorknob (a motion similar to pronation/supination).
Check
Confirm where your index finger actually contacts the A key (it should naturally land on the side of the index finger when the wrist rotates upward from F♯—not the pad of the finger).
For F♯→A, don’t “slide” the finger—use a roll-up motion.
The hardest moments are often instant switches like E→B♭, where:
the thumb moves to the register key, and
the index finger moves to the A key,
happening at the same time.
How to work on it
When your attention narrows to just the fingertips, the hand tightens, locks up, and loses smoothness.
Start slowly. With patience, keep refining the quality of the motion until it becomes smooth.
Start by moving the fingertip from the joints
Back to the thumb. When opening/closing the register key while covering the tone hole, many players try to force the motion from the “second joint” at the base of the thumb.
Instead, cultivate the sensation of moving the fingertip by letting
the fingertip, and
each finger joint
coordinate in small, flexible motions—moving from the joints.
Check
Which part of your thumb contacts the register key, and what motion does it create?
Are you sliding your thumb across the register key?
Are your fingertips stiff, with the joints not moving?
Do not tense the second joint (where the webbing begins)
The base of the thumb fatigues easily.
If you grip the instrument and tense here, you lose freedom in the other fingers.
Key ideas:
Don’t lock the base of the thumb.
Think less “push” and more “lightly receive.”
Don’t support with force in a way that blocks the other fingers.
Expand awareness from “fingers” to wrist, arm, and shoulder
When the left hand feels tight, the root cause is often not in the fingers, but higher up (wrist to shoulder).
Is the wrist fixed?
Is the forearm twisted?
Is the shoulder raised?
If you try to fix “just the fingers,” things can get even tighter.
The goal is for the fingers to move naturally inside a relaxed, flexible arm.
A quick pre-practice check (30 seconds)
Make a circle with your thumb and index finger (an OK sign, or like making “glasses”).
Adjust the angle and orientation so that the second joint of the thumb doesn’t collapse inward, and observe the thumb’s motion.
Next, pretend you’re wearing very long fake nails and try a “pinching” motion.
Notice that this motion is the exact opposite of how the thumb should work when you play.
A quick mini-exercise (30 seconds)
While holding the clarinet, let your left shoulder soften and drop slightly.
Add the intention of “releasing” the forearm (elbow to wrist).
Check whether the base of the left thumb has become firm.
Finally, try tiny fingertip motions (just lightly touching the keys is enough).
Rather than trying to “move the fingers well,” it often helps to release from the top down, which makes it easier for the thumb tension to let go.
Applied practice: left-hand strengthening etudes used at Fujiyama Clarinet Studio (including thumb and index finger)
Standard of Excellence: 31A, 66Q, B, C, D
Rubank Intermediate: Lesson 13-7
Paul JeanJean: “Motto” — left-hand practice (also available on Tomplay; Tomplay info is here)
Boccherini: Minuet (B♭–D, A–D / B-flat–D, A–D) (Tomplay includes this as an ABRSM Grade 3 piece; many studio students work on it. Blog.)
Summary
The left thumb is where you “support steadily” without pressing hard.
Move the fingertips from the joints.
Don’t tense the base of the thumb (this also helps prevent tendonitis).
Expand awareness up to the wrist, arm, and shoulder, and use the body with relaxed flexibility.
When playing feels easier and more stable, not only finger motion but also tone color and phrase flow begin to change.
Start by noticing where the thumb is tensing, and adjust little by little. So that your Left-Hand Tension on Clarinet hope to decrease.
About Fujiyama Clarinet Studio (online available)
Fujiyama Clarinet Studio offers in-person lessons in Yanai City, Yamaguchi Prefecture, and also provides an environment where you can continue learning online.
Issues like “my left hand locks up” or “my fingers won’t move” often improve once we observe your form and body use together and make targeted adjustments.
Online lessons: recommended for those who live far away or want ongoing form checks.
Details: About online clarinet lessons
Online salon (learning community): an online learning and exchange community for clarinet lovers, “The Clarinet Connection.”
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