Arms
Jalon caballero unialteral
A precise isolation movement designed to develop the brachialis for thicker, more defined arms.
How to perform.
Follow the sequence — setup is half the lift.
Assume a half-kneeling position with your right knee on the floor and your left foot planted firmly in front of you.
Hold a dumbbell in your right hand using a neutral grip with your palm facing inward toward your body.
Rest your right elbow against the inner part of your right thigh to create a stable anchor point for the movement.
Curl the dumbbell upward toward your shoulder while keeping your wrist straight and avoiding any torso rotation.
Squeeze the muscle at the top of the contraction for one second to maximize tension.
Lower the dumbbell slowly back to the starting position until your arm is fully extended.
Complete the set on one side before switching your kneeling stance and repeating with the opposite arm.
Common mistakes.
Fix these first — they cost reps, kilos, and joints.
- Using momentum or swinging the torso to lift the weight.
- Allowing the elbow to drift away from the thigh support.
- Flexing the wrist excessively at the top of the movement.
- Shortening the range of motion by not fully extending the arm.
Muscles worked.
The primary movers do the work; the stabilizers keep the path honest.