If you’ve taken a Pilates class, you’ve probably heard an instructor say, “Let’s move into the Series of 5.” For some people, those words spark excitement. For others… they spark a little fear.

The truth is, the Series of 5 isn’t meant to leave you exhausted. It was designed by Joseph Pilates as a way to strengthen the entire core while teaching the body to move with control, precision, and efficiency.

At Cornerstone Pilates, we think of the Series of 5 as one of the best examples of what Pilates does differently. It’s not about how many repetitions you can do. It’s about how well you move.

What Is the Series of 5?

The Series of 5 is a sequence of five classic mat exercises that flow together with very little rest. While they certainly challenge your abdominal muscles, they’re really about coordinating your entire body.

Each exercise builds on the one before it, creating strength from the center while encouraging mobility in the hips, stability through the spine, and control of the limbs.

The five exercises are:

Single Leg Stretch
Double Leg Stretch
Single Straight Leg Stretch (Scissors)
Double Straight Leg Lower/Lift
Criss-Cross

Simple? Yes.

Easy? Not necessarily.

It’s More Than an Ab Workout

One of the biggest misconceptions about the Series of 5 is that it’s just an ab routine.

In reality, your abdominal muscles are acting as stabilizers while your arms and legs move. The goal is to maintain a stable trunk without gripping your neck, holding your breath, or using momentum.

Done correctly, you’ll also challenge your:

Hip flexors
Deep core muscles
Obliques
Back stabilizers
Shoulder girdle
Breathing mechanics
Coordination

The exercises teach your body to create movement from a stable center—a skill that carries into everything from walking and golfing to lifting groceries and playing with your grandchildren.

Quality Always Beats Quantity

One of the beautiful things about Pilates is that every exercise has modifications.

At Cornerstone Pilates, we often remind clients:

Your goal isn’t to get your legs lower. Your goal is to keep your spine stable while your legs move.

That may mean:

Keeping your head down
Bending your knees
Moving through a smaller range of motion
Slowing the pace
Taking breaks when needed

These aren’t shortcuts. They’re smart progressions that allow your body to build strength without sacrificing alignment.

Why Breathing Matters

The Series of 5 has a natural rhythm with the breath.

Instead of holding tension, Pilates encourages full, intentional breathing to support the movement. Proper breathing helps activate the deep abdominal muscles while reducing unnecessary tension in the neck and shoulders.

Many people are surprised that improving their breathing can actually make the exercises feel easier—and more effective.

Common Mistakes We See

The most common errors include:

Pulling on the neck
Letting the lower back arch away from the mat
Moving the legs too low too soon
Racing through the exercises
Holding the breath

These habits shift the work away from the muscles we’re trying to strengthen.

That’s one reason having an experienced instructor is so valuable. Small adjustments can completely change how the exercises feel.

Why We Love Teaching the Series of 5

The Series of 5 isn’t about earning bragging rights.

It’s about learning control.

Over time, clients often notice they stand taller, feel stronger getting out of bed, experience better posture, and move through daily life with more confidence.

The sequence also provides a wonderful benchmark. As your strength, mobility, and coordination improve, the exercises begin to feel smoother—not because they’ve become easier, but because your body has become more efficient.

At Cornerstone Pilates

We don’t believe everyone should perform the Series of 5 exactly the same way. Every body is different. Age, injuries, flexibility, and goals all matter.

Our instructors teach the version that’s appropriate for your body today while helping you safely progress over time. Whether you’re brand new to Pilates or have been practicing for years, the Series of 5 can continue to challenge and reward you.

Because in Pilates, the goal has never been to perform the hardest version. The goal is to move with strength, control, and confidence—and that’s exactly what the Series of 5 was designed to teach.