Should I fully lock out my elbows on the triceps extension machine?

Extend to near full extension where you feel peak triceps contraction, but avoid aggressively snapping into a hard lockout. This keeps tension on the muscle while protecting the elbow joint from unnecessary stress.

What is the difference between triceps extension machine and cable pushdowns?

The machine provides a fixed path with back support that isolates the triceps with minimal stabilization required. Cable pushdowns demand more core stability and allow varied grip positions but require better technique to avoid using momentum.

How do I know if the seat height is correct on the triceps extension machine?

Your elbows should align with the machine's pivot point so your upper arms rest comfortably on the pads without reaching up or pressing down. Proper alignment ensures the resistance path matches your natural elbow extension movement.

Triceps Extension (Machine)

The triceps extension machine is a fixed-path exercise that isolates the triceps by extending the arms against resistance while seated. It suits beginners learning arm extension mechanics and experienced lifters seeking consistent triceps isolation without stabilization demands.

Muscle group: Triceps
Primary muscles: triceps
Equipment: Machine

How to do the Triceps Extension (Machine)

Adjust the seat height so your elbows align with the machine's pivot point when seated.
Sit with your back flat against the pad and grip the handles with your upper arms resting against the support pads.
Begin with your elbows bent and forearms angled back, maintaining contact between your upper arms and the pads.
Extend your arms smoothly by straightening your elbows until they reach full extension without locking out hard.
Reverse the motion under control, returning to the starting position while keeping tension on the triceps.

Form tips

Keep your upper arms stationary against the pads throughout the movement to prevent shoulder involvement.
Avoid flaring your elbows outward by maintaining a neutral wrist and forearm position aligned with the handles.
Control the eccentric phase by resisting the weight on the way back rather than letting it pull your arms down quickly.

Common mistakes

Allowing the upper arms to lift off the support pads reduces triceps isolation and shifts work to the shoulders.
Locking out the elbows aggressively at full extension creates unnecessary joint stress without added muscle benefit.
Using momentum by bouncing at the bottom position diminishes time under tension and increases injury risk.

Sets and reps

For hypertrophy, perform 3 to 4 sets of 8 to 15 reps with moderate weight and controlled tempo; for strength, use 3 to 5 sets of 5 to 8 reps with heavier loads.

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Frequently asked questions

Should I fully lock out my elbows on the triceps extension machine?: Extend to near full extension where you feel peak triceps contraction, but avoid aggressively snapping into a hard lockout. This keeps tension on the muscle while protecting the elbow joint from unnecessary stress.
What is the difference between triceps extension machine and cable pushdowns?: The machine provides a fixed path with back support that isolates the triceps with minimal stabilization required. Cable pushdowns demand more core stability and allow varied grip positions but require better technique to avoid using momentum.
How do I know if the seat height is correct on the triceps extension machine?: Your elbows should align with the machine's pivot point so your upper arms rest comfortably on the pads without reaching up or pressing down. Proper alignment ensures the resistance path matches your natural elbow extension movement.

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