Exercise guide
Kettlebell Concentration Curl
- Beginner
- Isolation
- Rep-based
- Lower arms
- Upper arms
The kettlebell concentration curl is a highly effective isolation exercise that targets the biceps brachii, using the inner thigh as a brace to eliminate momentum and maximize peak contraction. The kettlebell's unique center of gravity provides a constant tension that challenges grip strength and forearm stability more than a standard dumbbell.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Sit on the edge of a flat bench with your feet planted firmly and wider than shoulder-width apart.
- Grasp the kettlebell handle with one hand using an underhand grip.
- Lean forward and brace the back of your upper arm (triceps) against the inside of your same-side thigh, just above the knee.
- Extend your arm fully so the kettlebell hangs toward the floor, ensuring your torso is stable.
How to do it
- Exhale and curl the kettlebell toward your shoulder by flexing the elbow, keeping your upper arm pinned firmly against your thigh.
- Squeeze your bicep hard at the top of the movement for a one-second pause to maximize muscle fiber recruitment.
- Inhale and slowly lower the kettlebell back to the starting position using a controlled 3-second eccentric tempo.
- Complete the desired number of repetitions on one arm before switching to the other side.
Form checklist
- Keep the elbow and upper arm stationary against the thigh throughout the entire set.
- Avoid swinging the torso or using the legs to assist the lift.
- Maintain a neutral, strong wrist to prevent the kettlebell from flopping or straining the joint.
- Ensure a full range of motion by fully extending the arm at the bottom without locking the elbow.
Pro tips
- Focus on driving your pinky finger toward your shoulder at the top of the rep to intensify the bicep peak contraction.
- Keep your non-working hand on your opposite knee or hip to maintain a stable, centered posture.
Make it harder
- Perform the movement 'bottoms-up' by holding the handle and balancing the bell upside down to drastically increase forearm and grip demand.
- Add a 3-second isometric hold at the 90-degree midpoint during the lowering phase to increase time under tension.
Frequently asked
- What muscles does the kettlebell concentration curl work?
- The kettlebell concentration curl primarily targets the biceps, and also works the forearms as secondary muscles.
- What equipment do you need for the kettlebell concentration curl?
- The kettlebell concentration curl uses kettlebell.
- Is the kettlebell concentration curl good for beginners?
- Yes. The kettlebell concentration curl is a beginner-friendly movement and a strong foundation to build on.