Overview
The Quadruped series brings the carriage under the hands and knees. It is a modern addition to the reformer repertoire that isolates the abdominals first, then layers on unilateral and cross-body work. Because the spine starts neutral and stays long, it is one of the most accessible ways to teach pelvic and scapular stability before the client moves to plank work.
The three core exercises build on each other:
- Quadruped Knee Tucks — pure abdominal isolation: the knees tuck while the spine stays long.
- Quadruped Single Leg Stretch — adds unilateral glute work while the hips stay square.
- Quadruped Bird Dog — the full cross-body pattern: opposite arm and leg reach.
Setup
- Place the hands on the footbar and the knees on the carriage in a four-point stance.
- Keep the springs light — 1 Green or 1 Yellow.
- Fold the footbar down so the hands land on the bar cleanly.
- The knees sit under the hips and the hands under the shoulders; the spine is neutral and the gaze is slightly down.
Key Teaching Cues
- Keep the spine long — the tuck comes from the abdominals, not from collapsing the low back.
- For the single leg stretch, keep the hip level: cue the glute to extend the leg rather than the lower back.
- For the bird dog, reach the opposite arm and leg at the same tempo — no rotation, no sag.
- The carriage should move smoothly; the springs are a mirror of control, not a race.
Common Faults
- Tucking from the hips instead of the abdominals — the movement becomes a hip hinge.
- Dropping the head or rounding the shoulders under load.
- Letting the hips rotate when the leg extends in the single leg stretch.
- Holding the breath as the carriage moves.
Progressions
- Master the knee tuck with the spine long before adding the leg.
- Add the single leg stretch once the hips stay square.
- Progress to the bird dog only when cross-body coordination is clean.
- From the bird dog, the client is ready for kneeling plank work such as Knee Stretches: Knees Off.
Variations
- Regression: work the knee tuck with the hands on the carriage instead of the footbar; keep the tuck small and the spine long.
- Progression: add a single-leg reach from the tuck position before attempting the full bird dog.
- Safety: widen the hand position and keep the pelvis lifted for comfort in pregnancy (see the Pregnancy Pilates Protocol).