Summary
Jeff Cavalier of ATHLEAN-X argues that true “split muscle group training” is a flawed approach because no muscle works in isolation. By adjusting body position relative to resistance, you can integrate core training into standard shoulder exercises, making every movement more athletic and efficient.
Key Points
- Split training is a myth in practice: Even on a designated “shoulder day,” other muscle groups — particularly the core — should and will be engaged if you train correctly.
- Body position is the key variable: Simply shifting your stance or angle in relation to the resistance source dramatically changes which muscles are recruited.
- Use cables or bands anchored low: A low cable or band attached to a bed post or similar anchor allows for more versatile, multi-muscle movements compared to standard free-weight exercises.
- The front raise gets a core upgrade: Stepping out to the side of a low cable or band during a front raise forces the obliques, lower back, and hip flexors to stabilize and decelerate the movement.
- Acceleration and deceleration both matter: Driving the movement explosively upward and then controlling it on the way down engages the core throughout the full range of motion.
- The lateral raise variation adds rotation: Taking an open stance and pulling across the body activates the medial deltoid and the core simultaneously, and can be alternated for both sides.
- Avoid upright row mechanics: When performing the lateral/medial deltoid pull, keep thumbs up and elbows below hand level — raising elbows above hands compresses the shoulder joint and risks shoulder impingement.
Exercise Details
Cable/Band Front Raise (Core-Integrated)
- Target muscles: Anterior deltoid, obliques, lower back, hip flexors
- Proper form cues:
- Anchor a band or cable at floor level
- Step out to the side and slightly forward, creating a diagonal pull
- Raise the arm up toward the top in a front raise pattern
- Control the descent slowly to load the core eccentrically
- Common mistakes to avoid:
- Performing the movement straight in front with dumbbells, which eliminates core involvement
- Rushing the downward phase and losing the deceleration benefit
- Optional variation: Perform explosively on the way up to increase demand on stabilizing muscles
Cross-Body Lateral Pull (Medial Deltoid + Core)
- Target muscles: Medial (lateral) deltoid, obliques, lower back
- Proper form cues:
- Use a low cable or band
- Take an open stance, reaching across the body to grip the handle
- Pull upward and outward with thumbs pointing up
- Keep elbows below hand level throughout the movement
- Rotate through the core as you pull up and across
- Common mistakes to avoid:
- Allowing elbows to rise above the hands (mimics an upright row and risks shoulder impingement)
- Keeping a square stance, which removes the rotational core engagement
- Bilateral option: Switch sides by reversing the open stance to target the opposite side