Mermaid

Body Part: Pilates

Muscle: Other

Equipment: Body Weight

Mermaid is a classic Pilates side-bending exercise performed from a seated floor position. One leg is folded beside or behind the body, the other hip stays grounded, and the torso arcs away from the supporting hand while the top arm reaches overhead. The movement is slow and controlled, with the goal of creating length through the side body instead of collapsing into the shoulder or lower back.

This exercise primarily trains the obliques and the muscles that control lateral flexion of the trunk, while the lats, intercostals, quadratus lumborum, glutes, and shoulder stabilizers help keep the position organized. It also asks the hips and ribcage to move independently, which is why Mermaid is useful in Pilates sessions that focus on posture, spinal mobility, and clean breathing mechanics.

The setup matters because Mermaid only feels smooth when the pelvis is anchored and the spine starts tall. Sit with the support hand planted firmly on the floor, keep the ribcage stacked over the pelvis, and let the top arm create space before you lean. If the bottom side collapses or the shoulder shrugs toward the ear, the stretch gets shorter and the control drops off quickly.

During each repetition, inhale to lengthen upward first, then exhale as you side bend and reach overhead in one continuous arc. The return should be just as controlled as the descent, with the trunk lifting back to center rather than snapping upright. A small but clean range is more valuable than forcing a big bend that twists the torso or lifts the grounded hip.

Mermaid works well as a warm-up, mobility drill, or accessory movement in a Pilates or core-focused session. It is usually beginner-friendly because the load is just body weight, but the position still demands patience and precision. Use it to open the side body, reinforce upright posture, and practice breathing into a long, supported torso.

Instructions

• Sit on the floor in the Mermaid position with one leg folded to the side or behind you and the opposite shin angled away so your hips can stay level.
• Plant the hand closest to the floor beside your hip, keep that shoulder down, and stack your ribs over your pelvis before you move.
• Reach the free arm overhead and slightly forward so the side of your torso feels long before the bend begins.
• Inhale to grow taller through the crown of your head and keep both sit bones heavy on the floor.
• Exhale and arc the torso away from the supporting hand, letting the top arm follow a smooth side-bending path.
• Keep the chest open and avoid twisting forward as you reach, so the movement stays in the side body.
• Pause briefly at the deepest comfortable point, then keep the reach as you inhale back to the tall starting position.
• Repeat for the planned reps, then switch sides and match the same range and control.

Tips & Tricks

• Keep the support shoulder away from your ear so the side bend comes from the ribs, not a shrug.
• Press the grounded hand lightly into the floor to create space before you lean farther.
• If your bottom hip keeps lifting, shorten the range and keep that seat bone anchored.
• Reach the top arm long overhead instead of letting it drift behind you and turn the torso open.
• Think of lengthening the whole side of the body on the way down, then lifting back through the waist on the way up.
• A small, smooth arc is better than chasing a big bend that compresses the lower back.
• If the wrist or shoulder feels crowded, place the support hand a little farther from the hip.
• Keep the neck long and let your head follow the line of the spine instead of dropping forward.

Frequently Asked Questions

What muscles does Mermaid work most?

It mainly works the obliques and other side-body muscles, with help from the lats, intercostals, quadratus lumborum, and shoulder stabilizers.

Is Mermaid a stretch or a strength exercise?

It is both, but it is usually used as a controlled mobility and trunk-strength drill rather than a loaded strength exercise.

Where should my supporting hand be?

Place it beside the hip that is on the floor, close enough to support you without collapsing the shoulder toward the ear.

Should the grounded hip stay down during Mermaid?

Yes, the grounded hip should stay heavy and level so the bend comes from the torso instead of from sliding off the seat.

Why do I feel Mermaid in my shoulder?

That usually means the support hand is too close or the shoulder is shrugging. Move the hand slightly farther out and keep the shoulder blade relaxed.

Can beginners do Mermaid comfortably?

Yes. It is beginner-friendly when you keep the range small, move slowly, and use the floor hand for balance.

How should I breathe during the movement?

Inhale to lengthen tall first, then exhale as you side bend and reach. Inhale again as you return to center.

What if I feel a pinch in my lower back?

Reduce the range and keep the ribs stacked over the pelvis. Mermaid should feel like a long side stretch, not a low-back compression.