Dead Bug Marching

CoreBW

The simplest regression of the dead bug — only the legs march up and down one at a time while the arms stay still, reducing the coordination demand for absolute beginners.

Demo: Functional Movement Systems

Sets

3

Reps

8-10 per side

Rest

30s

Contraindications

None significant — this is often the first exercise prescribed after low back injury.

Setup

Lie on your back, hips and knees bent to 90 degrees, arms resting at the sides or on the belly.

Execution

  1. 1Press the low back flat into the floor before moving
  2. 2Lower one leg slowly toward the floor, maintaining the 90-degree knee bend
  3. 3Stop just before the low back arches off the floor
  4. 4Return the leg to the start under control
  5. 5Alternate legs, keeping the low back pinned throughout

Key cues

  • Low back never leaves the floor
  • Move slow, one leg at a time
  • Exhale as the leg lowers
  • Stop before you feel the back want to arch

Common faults

  • Low back arching as the leg lowers
  • Moving both legs at once, defeating the marching regression's purpose
  • Rushing instead of a slow controlled march
  • Lowering the leg further than control allows

Tweaks

  • Progress to full dead bug with arm reach once marching is solid
  • Add a small band around the knees for light resistance
  • Increase range of motion gradually

Progressions

Dead Bug

Muscles

Primary: Transverse Abdominis

Secondary: Hip Flexors

Notes

ANTI-EXTENSION, difficulty 1, gentlest entry point to the dead bug family.

Sources

Attribution: Gray Cook / FMS canon, beginner regression