Exercise guide
Kettlebell Standing One Arm Extension
- Intermediate
- Isolation
- Rep-based
- Shoulders
- Upper arms
This unilateral isolation exercise targets the long head of the triceps by placing the muscle in a fully stretched overhead position. The kettlebell's unique center of gravity provides a distinct resistance profile that challenges stability more than a traditional dumbbell.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Stand with your feet shoulder-width apart and engage your core to stabilize your spine.
- Clean the kettlebell to your shoulder, then press it directly overhead until your arm is fully extended.
- Rotate your palm inward so it faces your head and tuck your elbow close to your ear.
- Place your non-working hand on your ribcage or use it to lightly support the working arm's triceps for stability.
How to do it
- Inhale and slowly lower the kettlebell behind your head by bending only at the elbow, keeping your upper arm vertical and stationary.
- Lower the weight until you feel a deep stretch in the triceps, maintaining a controlled 2-second eccentric phase.
- Exhale and contract your triceps to extend your arm back to the starting overhead position.
- Complete the desired number of repetitions on one arm before switching to the other side.
Form checklist
- Keep the elbow pointing forward or slightly inward; do not let it flare out to the side.
- Maintain a neutral lower back by squeezing your glutes; do not allow your ribs to flare or your back to arch.
- Ensure only the forearm moves; the upper arm should remain locked in place next to your head.
- Keep your chin tucked and gaze forward to avoid neck strain.
Pro tips
- Focus on the mind-muscle connection during the bottom stretch, as the long head of the triceps is most active when fully lengthened.
- Grip the kettlebell handle firmly to increase neural drive and forearm stability throughout the movement.
- At the top of the rep, squeeze the triceps hard but avoid a forceful 'snap' of the elbow joint.
Make it harder
- Incorporate a 3-second pause at the bottom of each rep to eliminate momentum and maximize time under tension in the stretched position.
- Perform the exercise from a half-kneeling position to further challenge core stability and prevent lower body compensation.
Frequently asked
- What muscles does the kettlebell standing one arm extension work?
- The kettlebell standing one arm extension primarily targets the triceps, and also works the deltoids as secondary muscles.
- What equipment do you need for the kettlebell standing one arm extension?
- The kettlebell standing one arm extension uses kettlebell.
- Is the kettlebell standing one arm extension good for beginners?
- The kettlebell standing one arm extension is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.