Exercise
ALTERNATING ARM COBRA
Form cues
About
The Alternating Arm Cobra is a dynamic prone exercise that builds posterior chain coordination by combining the spinal extension of a Cobra with unilateral shoulder and upper back activation. Each repetition simultaneously extends the spine, retracts one scapula, and loads the posterior deltoid and rhomboid on the working side — making it an effective warm-up drill for overhead pressing and pulling movements, and a useful corrective for rounded shoulders.
Instructions
Step-by-step technique
Starting Position
Lie face down on a mat in a prone position with your arms at your sides and palms facing down.
Engage Core & Glutes
Squeeze your glutes and engage your core to protect the lower back.
Lift the Chest
Lift your chest off the floor by extending through the thoracic spine.
Alternate Arms
While holding the chest up, alternately swing one arm to the side and back, then the other.
Keep Arms Straight
Keep your arms straight throughout and your chest lifted at all times.
Repeat for desired reps on each side
Common mistakes
What goes wrong — and why
Lifting too high and compressing the lower back
Excessive spinal extension, especially in beginners with tight hip flexors, compresses the lumbar facet joints and produces discomfort rather than productive training.
Only lift to the height where the lower back feels comfortable. The focus should be on the scapular retraction of the raised arm, not the height of the torso.
Not fully extending the reaching arm
Partially reaching reduces the thoracic rotation component and diminishes the stretch through the posterior shoulder and lat.
Extend the raised arm fully, reaching long through the fingertips. Think of making the arm as long as possible rather than lifting it as high as possible.
Moving too fast between sides
Rapid alternation removes the isometric hold at the top that develops the posterior chain endurance this exercise is designed to build.
Pause for 2 seconds at the top with each arm raise before switching. Slower execution deepens the muscular activation.
Variations · Progressions · Regressions
Adaptations for every level
Basic Cobra
Perform the Cobra without the unilateral arm raise. Builds the spinal extension capacity and glute engagement needed before adding the alternating arm component.
Contralateral Superman
Raise the opposite arm and leg simultaneously in the classic Superman pattern. More posterior chain loading than the Alternating Arm Cobra with less upper-back specificity.
Alternating Arm Cobra with Band Pull-Apart
Hold a resistance band taut with both hands, then perform the alternating cobra while maintaining tension in the band. Adds rhomboid and posterior deltoid loading to the movement.