Iso Lateral Machine Shoulder Press

Also known as: iso lateral shoulder press

In SetGrip: Machine Shoulder Press (Iso Lateral)

Secondary muscles
Triceps, Pectorals
Body part
Shoulders
Position
Standing
Laterality
Bilateral (both sides together)
Category
Strength

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Independent handles mean your stronger arm cannot quietly finish reps for the weaker one, which a barbell or fixed machine lets happen for years. Load each side separately with plates and you can even run an extra set for the lagging shoulder. The arc converges slightly overhead, closer to a dumbbell path than a straight bar.

How to do the Iso Lateral Machine Shoulder Press

  1. Load the plates, set the seat so the handles are at shoulder height and sit with your back against the pad.
  2. Grip both handles; each arm moves its own lever.
  3. Press both handles overhead until your arms are almost straight.
  4. Lower them back to shoulder height under control.

Tip: Take a breath and brace before unracking, then press up and slightly back so the bar ends over the middle of the foot.

Muscles worked

Primary

Delts · Shoulders

The front and side delts drive the weight off the shoulders and should carry the load all the way to lockout; the burn builds across the whole shoulder cap.

Secondary

  • Triceps — The triceps take over in the top half to lock the elbows, and a weak lockout usually means they need direct work.
  • Pectorals

Common mistakes

  • Leaning back into an incline — if the lower back arches hard, the chest is doing the work; squeeze the glutes, brace the abs and keep the ribs down.
  • Pressing around the head — the bar should travel straight up, so pull the chin back to let it pass, then push the head through at the top.
  • Stopping short of lockout — finish with the arms straight and the bar stacked over the shoulders and hips, shoulders shrugged slightly up at the top.
  • Elbows drifting behind the bar — keep the elbows slightly in front of the bar at the bottom, with the wrists stacked straight above them.

Where it fits in a workout

Overhead presses go first in a shoulder session or second after bench in a push day. Superset them with a pulldown or pull-up for a vertical push and pull pair.

How many sets, how heavy and how hard: see what the ACSM position stands support.

Variations and alternatives

Similar exercises

Without machine

Easier and harder

When to talk to someone

  • Chest discomfort, feeling faint or lightheaded, or trouble breathing during or after exercise can be signs of a heart attack. In the US, call 911 right away; elsewhere, call your local emergency number.
  • Heart, metabolic or kidney disease, or symptoms like these when you are active: talk to your doctor before you start or step up training.
  • Pregnant: ask your obstetric care provider which exercise suits you.

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More exercises

Sources

  1. ACSM position stand on exercise quantity and quality (Garber et al., 2011)
  2. ACSM preparticipation health screening (Riebe et al., 2015)
  3. ACOG Committee Opinion No. 804 on exercise in pregnancy (2020)
  4. CDC: About Heart Attack Symptoms, Risk, and Recovery (2024)

Sources checked on October 17, 2026. Full citations are in the exercise library.

Animation and exercise data: ExerciseDB, licensed to SetGrip. General information, not medical or coaching advice.