Small movements, big sensations. Let's get into the science behind that infamous barre shake.
If you've ever taken a barre class, you probably know the exact moment we're talking about. You're holding a plié, your heels are lifted, your instructor asks for eight more pulses, and suddenly your legs have developed a mind of their own.
The shaking starts, you look around the room to see if anyone else is experiencing the same thing, and you wonder how such a small movement could possibly be this challenging.
Welcome to the barre shake, bestie.
It's one of the most recognizable experiences in barre, and something we hear about from clients all the time. But while that trembling sensation has become almost synonymous with barre workouts, there's actually some interesting exercise science behind what's happening in your muscles.
And perhaps more importantly, shaking isn't necessarily an indication that you're getting a better workout.
Why Small Movements Can Feel So Challenging
One of the things that makes barre different from traditional strength training is the way we challenge muscular endurance.
In a strength-focused class like PSC Drip & Flow, you might perform a series of squats or lunges with dumbbells, moving through a larger range of motion with the goal of developing strength against resistance.
In PSC Barre, we're often working with smaller ranges of motion, sustained positions, and repeated movements that keep particular muscle groups engaged for an extended period.
Think about holding a plié while performing tiny pulses or maintaining your arms in an elevated position through a sequence of controlled movements. Even though the movements themselves may be small, your muscles are continuously working to maintain the position and produce force.
This is particularly noticeable during isometric contractions, which occur when your muscles generate tension without significantly changing length. Holding a squat, maintaining a balance position, or keeping your arms extended are all examples of muscular work that can involve isometric contractions.
When you combine sustained tension with repeated movements, your muscles begin to fatigue. And sometimes, that fatigue shows up as shaking.
Let's Get a Little Nerdy: What's Actually Happening When Your Muscles Shake?
Every movement you make involves communication between your nervous system and your muscles.
When your brain sends a signal to perform a movement, it activates groups of muscle fibers through structures called motor units. Each motor unit consists of a motor neuron and the muscle fibers it controls. As an exercise becomes more demanding, your nervous system adjusts how many motor units are recruited and how frequently they're activated to produce the force needed to maintain the movement.
During sustained contractions, especially as fatigue accumulates, your body's ability to produce a perfectly steady level of force can become more difficult. Small fluctuations in muscular force, combined with the demands of maintaining balance and positioning, can contribute to the trembling sensation you experience.
And balance plays a bigger role than you might think.
When you're standing on one leg, lifting your heels, or maintaining a challenging position, your body is constantly making small adjustments to keep you stable. Your nervous system is coordinating those adjustments while your muscles are already working to maintain tension. That's a lot happening behind the scenes for what might look like a very simple movement.
It's also why shaking can happen even when you're not using heavy weights. The challenge isn't always the amount of resistance you're lifting. Sometimes it's the amount of time your muscles are working, the position you're maintaining, and the level of control required.
Does Shaking Mean Your Workout Is Working?
Here's where we want to clear up one of the biggest misconceptions about barre.
Shaking isn't a requirement for an effective workout.
While trembling can be a sign that your muscles are experiencing fatigue or that your nervous system is working hard to maintain a position, it doesn't tell us how much strength you're building, how many calories you're burning, or whether the exercise is producing better results.
You can have an incredibly effective barre class without shaking at all.
And you can experience shaking during an unfamiliar movement simply because your body is still learning how to coordinate it. The effectiveness of your workout depends on a combination of factors, including the challenge you're placing on your muscles, your movement quality, your training consistency, and your ability to recover and adapt over time.
We love seeing clients challenge themselves, but we never want you to feel like you need to chase the shake to make your workout count. If your legs start trembling during a challenging sequence, that's okay. If they don't, that's okay too.
What matters is that you're moving with intention and challenging yourself in a way that's appropriate for your body.
Why Barre Is Such a Great Complement to Strength Training
One of the reasons we love offering both PSC Barre and PSC Drip & Flow is that they challenge your muscles in different ways.
Traditional resistance training often emphasizes developing strength through progressively increasing resistance. Barre frequently incorporates lighter resistance, sustained positions, higher repetitions, and balance challenges that emphasize muscular endurance and control.
Muscular endurance refers to your muscles' ability to repeatedly produce force or maintain a contraction over time. It's an important component of physical fitness, and one that complements the strength you're developing through resistance training.
Barre also creates opportunities to work on balance, coordination, and body awareness. When you're maintaining alignment through a challenging sequence or transitioning between positions, you're asking your muscles and nervous system to work together to keep you stable.
That doesn't mean barre replaces traditional strength training, particularly if increasing maximal strength is one of your goals. But it can be a valuable addition to a well-rounded routine. At PSC, we believe the best movement practices incorporate different types of challenges rather than relying on one style of exercise to accomplish everything.
And barre fits beautifully into that approach.
What Should You Do When Your Muscles Start Shaking?
First, remember that a little trembling during a challenging exercise isn't necessarily something to worry about.
If you're able to maintain your alignment, control your movement, and continue breathing comfortably, you may simply be experiencing the normal demands of muscular fatigue. But there's an important difference between challenging yourself and pushing past the point where you can maintain good technique.
If you notice your alignment changing significantly, you're struggling to maintain balance, or the movement no longer feels controlled, that's your cue to adjust. You might reduce your range of motion, lower your heels, use the barre for additional support, or take a short break before continuing. And if you're experiencing pain, dizziness, unusual weakness, or shaking that doesn't resolve after the exercise, it's important to stop rather than assume it's just part of the workout.
Your instructor can always help you find a variation that allows you to continue working effectively. Remember, modifications aren't a step backward. They're a way to make movement work for your body.
A Little Sunday Barre, Anyone?
If all this talk about barre has you curious, we'd love to see you on Sunday mornings.
PSC Barre | Sundays at 10:00 AM with Kendra
Whether you're brand new to barre or you've been taking classes for years, PSC Barre offers an opportunity to challenge your muscular endurance, develop greater control, and explore a different style of movement.
You can expect small, intentional movements, sustained positions, balance work, and a whole lot of good energy. And yes, you might experience a little shaking along the way.
Just remember that the goal isn't to see how much your muscles can tremble. It's to build strength, endurance, and confidence through movement that challenges you appropriately. So the next time you're holding that plié and your legs start doing their own thing, you'll have a better understanding of what's happening.
Your muscles are working, your nervous system is coordinating, and your body is responding to the demands of the exercise. And if your instructor asks for eight more pulses? Well, now at least you know why they feel like such a big deal.
Ready to experience PSC Barre? Join Kendra on Sundays at 10:00 AM and find your rhythm at the barre.