Exercise guide
Forearm - Supination
- Beginner
- Isolation
- Timed hold
- Lower arms
- Upper arms
This isolation movement targets the supinator and biceps by rotating the forearm against self-applied resistance, improving wrist stability and forearm thickness. It is highly effective for developing the mind-muscle connection in the rotational muscles of the arm without needing external weights.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Primary
Equipment
Setup
- Sit or stand tall with your elbow tucked firmly against your side and bent at a 90-degree angle.
- Rotate your forearm so your palm faces the floor in a fully pronated position.
- Place your opposite hand over the back of your active hand to provide manual resistance.
How to do it
- Rotate your forearm outward until your palm faces the ceiling, pushing steadily against the resistance of your opposite hand.
- Exhale during the rotation and focus on squeezing the forearm and biceps at the peak of the movement.
- Inhale as you slowly return to the starting palm-down position, maintaining manual tension throughout the eccentric phase.
- Complete the desired repetitions for one arm before switching to the other.
Form checklist
- Keep your elbow pinned to your ribcage to prevent the shoulder from taking over the movement.
- Ensure the rotation comes strictly from the forearm rather than leaning your torso.
- Maintain a consistent level of manual resistance throughout the entire range of motion.
- Keep your wrist in a neutral, straight position; do not let it flex or extend.
Pro tips
- Focus on leading the rotation with your pinky finger to maximize the engagement of the supinator muscle.
- Vary the manual pressure from your resisting hand to create a 'descending set' effect as the muscle fatigues.
Make it harder
- Add a 3-second isometric squeeze at the point of maximum supination (palm up) on every rep.
- Perform the movement with a slightly extended elbow to increase the leverage challenge on the biceps.
Frequently asked
- What muscles does the forearm - supination work?
- The forearm - supination primarily targets the forearms.
- What equipment do you need for the forearm - supination?
- The forearm - supination requires no equipment — just your body weight.
- Is the forearm - supination good for beginners?
- Yes. The forearm - supination is a beginner-friendly movement and a strong foundation to build on.