StrengthIn review

Cross-Body Hammer Curl

An alternating neutral-grip dumbbell curl toward the opposite shoulder.

This page is a working draft. A coach has not reviewed it, so read it as a starting point, not as checked instruction.

Pattern: Elbow flexion
Modality: Strength
Difficulty: Beginner
Mechanic: Unknown
Force: Unknown
Laterality: Alternating
Impact: Low
Trains where: Gym, Home
At home: Yes

How to do it

Set up

Stand tall or sit upright on an optional bench with a dumbbell in each hand.
Keep the palms facing inward.

Do the rep

Curl one dumbbell across the front of the torso toward the opposite shoulder without turning the wrist.
Lower to a straight arm, then curl the other side.

What counts as a rep

Each cross-body curl and return to a straight arm counts as one rep; alternate sides and count both sides together.

Breathing

Exhale as you curl; inhale as you lower.

Cues

Keep the wrist neutral.
Keep the torso still.
Lower under control.

Common mistakes

Torso swings
What you seeThe hips or shoulders move to start the curl.
FixReduce the load and keep the torso still.
A still torso keeps the load at the elbows.
Wrists bend under the load
What you seeThe hands fold forward or backward during the rep.
FixUse less weight and keep the wrists aligned with the forearms.
Aligned wrists help the user control the dumbbells.

Stop the set if

Stop if you feel sharp pain.
Stop if the grip slips or you must swing the torso to lift the weight.
End the set when you cannot complete the stated rep under control.

General educational content, not individual coaching or medical advice.

Muscles worked

Prime movers

Biceps · moderate confidence
Brachialis · moderate confidence

Assisting

Forearms and grip · moderate confidence

Equipment

Dumbbell

Optional: Bench

Stand tall or sit upright on an optional bench with a dumbbell in each hand. Keep the palms facing inward.

In the app

You log this by hand. The camera coach does not watch this movement yet.

Tracking: Manual

How this page was checked

Draft. A editorial reviewer has not signed this off yet.

Draft text is original copy for Wave 2 batch 10, written from the blueprint CSV row and the owner rules approved on 2026-10-12 in #340. No human review is complete.
Technique, cues, rep standard, breathing, stop cues, and error corrections need independent sources and the assigned review tier (blueprint two-source rule).
Programming roles, skill tier, failure cost, timed use, goal fit, and equipment follow the owner rules; the switch-on PR must confirm them.
Anatomy uses the CSV planning hints unless an exception is stated; the assigned review tier must confirm it.
Legacy relations and engine edges stay empty until the progression ladder lane and S2-CAT-005.
Rule 4 skips no aliases in this batch. All 21 rows remain separate draft records; the owner can make overlaps aliases in the switch-on PR.
Timed use and goal fit copy ex_hammer_curl, the closest Wave 1 record. Timed use remains disallowed; no Wave 1 review evidence is claimed for this draft.
Rule 2 assigns secondary_pull, isolation_target by movement, as ex_hammer_curl.
Skill tier beginner (rule 3): a new user can perform one clean rep in the first session with a suitable load.
Failure cost low (rule 3): the user stops by lowering the dumbbells, as ex_dumbbell_biceps_curl and ex_dumbbell_lateral_raise.
Exception to the CSV bilateral laterality (rule 1): use alternating and total_alternating; alternate arms and count both sides together, as ex_reverse_lunge.
Rule 1 sets dumbbell quantity 2: the movement uses two dumbbells, as ex_dumbbell_biceps_curl.
Prescription uses load-and-reps with load in kg (rule 1), as ex_one_arm_dumbbell_row and ex_dumbbell_biceps_curl. The load_unit constraint states the unit explicitly; load basis and rep range still need review.
The cross-body finish height and upper-arm path need review.

All instruction and editorial text in this record is original draft copy written for Allena. Planning metadata comes from the internal Wave-2 blueprint CSV.

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