Machine Triceps Extension
- Secondary muscles
- Delts
- Body part
- Upper Arms
- Position
- Standing
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Machines earn their place in triceps work by removing the setup problem: no bench, no bar over your face, just a seat, a pad, and handles that travel one path. That makes it the safest place in this family to train close to failure or run drop sets, though the fixed track fits some arm lengths better than others.
How to do the Machine Triceps Extension
- Adjust the seat height and position yourself on the machine with your back against the pad.
- Grasp the handles with an overhand grip and fully extend your arms in front of you.
- Keeping your upper arms stationary, slowly lower the handles towards your forehead by bending your elbows.
- Pause for a moment at the bottom, then push the handles back up to the starting position by extending your arms.
- Repeat 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.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Muscle growth | 3–4 × 10–15 | 60–90 s |
| Endurance / finisher | 2–3 × 15–20 | 45 s |
| Strength | Not ideal — pick a compound lift for the same muscle | — |
Triceps extensions go after the presses in a push session or at the end of an arm day. Superset them with biceps curls on the same cable stack or with the same dumbbells.
Variations and alternatives
Similar exercises
Without machine
Frequently asked questions
What muscles does the Machine Triceps Extension work?
The Machine Triceps Extension primarily works the triceps. It also involves the delts, which assist the movement and stabilise the joints.
Is the Machine Triceps Extension good for beginners?
Yes. The Machine Triceps Extension is rated beginner: it uses a machine and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Machine Triceps Extension?
If you cannot do the Machine Triceps Extension, try the Dumbbell Skull Crusher, the Seated Back Supported Dumbbell Overhead Triceps Extension or the Dumbbell Overhead Triceps Extension. Each of them trains the triceps through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Machine Triceps Extension, a sensible starting point is muscle growth: 3–4 × 10–15 with 60–90 s rest; endurance / finisher: 2–3 × 15–20 with 45 s rest. Do it after your compound lifts. It is a finishing movement, not the main event.
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