BOSU Bird Dog
A bird dog with hands or knees on the BOSU dome, training the core to resist rotation while the opposite arm and leg reach long.
Level: Foundation
Primary: Abs
Secondary: Back - Lower Glutes
Movement: Isolation
Tags: Anti-Rotation Balance / Stability Core Stability
Type: Functional Fitness (Obstacle & Hybrid)
Equipment: Balance Trainer
Target muscles
This is an anti-rotation drill: as one arm and the opposite leg extend, the obliques and transverse abdominis fight the urge to twist and the spinal erectors hold a neutral lumbar position. The gluteus maximus extends the reaching hip, and the shoulder stabilisers steady the planted arm. The wobble of the dome amplifies every correction, so the deep core works far harder than on the floor.
How to perform
Setup
Set your hands on the dome shoulder-width apart (or place the knees on it for a gentler version) and find a quadruped position with hips over knees and shoulders over wrists. Brace your abs, draw the ribs down, and set a long neutral spine before you move.
Execution
Reach one arm straight forward as the opposite leg extends back to hip height, both limbs lengthening in line with the torso. The goal is a still pelvis — keep both hip bones pointing at the floor and do not let the lower back sag or rotate. Hold the end position for a beat, return under control without clunking the dome, and alternate sides. Move slowly; the value is in resisting the wobble, not in speed.
Common mistakes
- Hiking the reaching hip open so the pelvis rotates instead of staying square.
- Over-arching the lower back as the leg lifts above hip height.
- Rushing the swap and using momentum to fling the limbs out.
- Letting the supporting shoulder collapse rather than pushing the floor away.
Progressions and regressions
Regress to a floor bird dog or keep the knees on the dome with only the arm reaching. Progress by adding a pause and a small "row" of the front arm, by extending the limbs more slowly, or by balancing both hands and feet around the dome for a steeper stability challenge.
Programming notes
Program it in a warm-up to switch the core on, or as low-load accessory work for 2-3 sets of 8-12 controlled reps per side (or 20-30 second holds). It rewards quality over quantity — if the pelvis starts twisting, the set is done. Pairs well with a hip-hinge to reinforce a braced, neutral spine under load.
