Alternating Dumbbell Lying Triceps Extension
In SetGrip: Dumbbell Lying Triceps Extension (Alternating)
- Secondary muscles
- Delts
- Body part
- Upper Arms
- Position
- Lying
- Laterality
- Alternating sides
- Category
- Strength
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Working one arm at a time while the other stays extended turns this into half extension, half isometric hold. The straight arm gets a long static contraction while the moving side works through its rep, and the pace forces stricter control than lowering both dumbbells together, which is why it suits lighter loads and newer lifters.
How to do the Alternating Dumbbell Lying Triceps Extension
- Lie flat on a bench with a dumbbell in each hand, palms facing each other.
- Extend your arms straight up over your chest, keeping a slight bend in your elbows.
- Lower one dumbbell down towards your head, bending at the elbow, while keeping the other arm extended.
- Pause for a moment at the bottom, then raise the dumbbell back up to the starting position.
- Repeat with the other arm, alternating sides for the desired number of repetitions.
Tip: Keep a slight bend at the top on lying extensions to protect the elbow, but lock out fully on cable pushdowns.
Muscles worked
Primary
Triceps · Arms
The triceps straighten the elbow, and overhead variations stretch the long head at the bottom, so you should feel the whole back of the upper arm working with a hard squeeze at lockout.
Secondary
- Delts — The front delt holds the upper arm in position on overhead extensions and should feel tension but not be lifting.
Common mistakes
- Elbows flaring out — on overhead and lying extensions the elbows should stay pointed forward or up, not out to the sides, since flaring turns it into a press.
- Upper arm moving — the upper arm should be pinned in place and only the forearm should move; if the elbow drifts, drop the weight.
- Not finishing the rep — take every rep to a full triceps squeeze; on pushdowns that means a complete lockout for a count.
- Cutting the stretch — on overhead extensions let the weight travel down behind the head until you feel the long head stretch before pressing up.
Where it fits in a workout
Triceps extensions go after the presses in a push session or at the end of an arm day. Superset them with biceps curls.
How many sets, how heavy and how hard: see what the ACSM position stands support.
Variations and alternatives
Similar exercises
Without dumbbell
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
- All arms exercises
- All triceps exercises
- All dumbbell exercises
- Dumbbell triceps exercises
- Behind Head Close Grip Barbell Lying Triceps Extension
- Barbell Overhead Triceps Extension
- Seated Barbell Overhead Triceps Extension
- Seated Close Grip Barbell Overhead Triceps Extension
- Barbell Skull Crusher
- Behind Head Barbell Skull Crusher
Sources
- ACSM position stand on exercise quantity and quality (Garber et al., 2011)
- ACSM preparticipation health screening (Riebe et al., 2015)
- ACOG Committee Opinion No. 804 on exercise in pregnancy (2020)
- 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.