Lying Single Leg Butterfly
Lying Single Leg Butterfly Exercise Description
The Lying Single Leg Butterfly trains controlled hip external rotation and abduction while you stabilize the pelvis and lumbar spine. Performed supine with one foot planted, you “open” one knee to the side like a butterfly wing, then return under control without letting the pelvis roll. Primary contributors include the gluteus medius (hip abduction and pelvic stability), gluteus maximus posterior fibers, and the deep external rotators (piriformis, obturators, gemelli, quadratus femoris). The opposite side hip and the abdominal wall help maintain a neutral spine and level pelvis throughout. This bodyweight drill builds movement awareness at the hip joint, reinforces femur-in-socket rotation, and offsets the tendency to substitute spinal motion for hip motion. Keep the range of motion pain-free and only as large as you can maintain trunk and pelvic control. The focus is slow, precise control—no momentum, no arching, and no shifting weight onto one hip.
- Muscle Groups: Glutes, Hips
- Target Muscles: Gemellus Inferior, Gemellus Superior, Gluteus Maximus, Gluteus Medius, Obturator Internus, Piriformis, Quadratus Femoris
- Assisting Muscles: Sartorius
- Stabilizing Muscles: External Obliques, Internal Obliques, Multifidus, Quadratus Lumborum, Transversus Abdominis
- Body Area: Lower Body
- Body Parts: Hips, Legs, Upper Legs
- Body Surface: Back, Side
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Hip Abductors, Hip Extensors, Hip Rotators
- Joint Involvement: Single-joint
- Muscle Location: Deep Glutes, Deep Hip, Glutes, Upper Glutes
- Movement Direction: Rotational
- Muscle Position: Lateral, Posterior
- Gender: Female
How To Do The Lying Single Leg Butterfly Exercise
‘- Lie on your back with knees bent ~90°, feet flat and hip-width apart.
– Find neutral spine; lightly brace your abdominals and keep the pelvis level.
– Keep both feet rooted (heel, base of big toe, base of little toe).
– Without moving your pelvis, let the right knee open out to the side from the hip.
– Keep the left knee pointing straight up; do not let the pelvis tilt or rotate.
– Open only as far as you can maintain even weight on both sides of the pelvis.
– Draw the right knee back over the foot with controlled tension—no snapping.
– Breathe smoothly; avoid holding your breath.
– Switch sides, matching the same controlled range and stability.
Lying Single Leg Butterfly Tips
‘- Lie on your back with knees bent about 90° and feet flat at hip-width.
– Find and maintain a neutral spine with a light abdominal brace.
– Keep the pelvis level and avoid arching your lower back as you move.
– Root each foot through the heel, base of the big toe, and base of the little toe.
– Let the working knee open out to the side from the hip only, without moving your pelvis.
– Keep the opposite knee pointing straight up the entire time.
– Open the knee only within a pain-free range where you can keep even weight on both sides of the pelvis.
– Draw the moving knee back over the foot with slow, controlled tension—no snapping or momentum.
– Breathe smoothly throughout the movement and avoid holding your breath.
– When you switch sides, match the same controlled range of motion and pelvic stability.
Lying Single Leg Butterfly Beginner Introduction
The Lying Single Leg Butterfly is a gentle floor-based hip drill that highlights how the hips move independently from the lower back. It is done on the back with both knees bent, one foot staying firmly in contact with the ground while the other leg moves. As the moving knee glides outward and then returns, the pelvis and lower spine are intended to stay steady, so the motion comes mainly from the hip joint instead of the back.
This small, controlled pattern places emphasis on the upper glutes, glutes, and deep hip muscles that turn the leg outward, while the abs and the opposite hip work to steady the trunk. The exercise encourages a clear sense of the thigh rotating smoothly in the hip socket and helps build awareness of when the back might begin to “help out” instead. The tempo is unhurried and deliberate, favoring calm breathing and smooth tension over swinging or jerking, with a range of motion that respects comfort while maintaining stable alignment.