The one arm biceps side curl with resistance band is a unilateral curl performed with the band anchored under your foot or at a low point beside you, with the working arm curling from a position slightly out from the torso rather than tucked tight against it. Training one arm at a time lets you focus on each side independently and helps address strength imbalances between arms. The band's accommodating resistance keeps tension on the biceps throughout the entire range of motion.
Muscles Targeted
- Primary: Biceps brachii
- Secondary: Brachialis, brachioradialis
- Tertiary: Forearm flexors, obliques (anti-rotation stabilization)
Starting Position
Secure a resistance band under the foot on your working side, or anchor it at a low point beside you. Stand with feet shoulder-width apart, holding the free end of the band in your working hand with an underhand grip. Let your arm extend down and slightly out from your torso, with your free hand braced on your hip for stability.
Execution Steps
- Brace your core to resist any rotation of the torso
- Curl the band upward, drawing your hand toward your shoulder
- Allow a natural slight inward path as your arm is not pinned against your side
- Squeeze the biceps for a brief pause at the top of the movement
- Lower the band slowly, resisting its pull, back to the starting position
- Complete all reps on one side, then switch arms and repeat
- Keep tension in the band throughout every rep on both sides
Form Cues
- Keep your torso square: resist the urge to lean or twist toward the working arm
- Maintain light tension in the band even at the bottom of the rep - don't let it go slack
- Move through a smooth, controlled arc rather than yanking the band upward
- Keep the wrist neutral and avoid excessive rotation as you curl
- Brace the non-working hand on your hip or a fixed point to stay balanced
Common Mistakes
- Leaning or twisting the torso toward the working arm: shifts the load onto the obliques and lower back instead of the biceps; keep hips and shoulders square.
- Letting the band go slack at the bottom: removes tension and reduces the training stimulus; keep light tension throughout the full rep.
- Choosing a band with too much resistance: causes swinging and momentum-driven reps; drop to a band you can control with strict form.
- Flaring the elbow excessively away from the body: shifts stress into the shoulder joint; keep the elbow path controlled and consistent.
- Rushing through reps: reduces time under tension and increases reliance on momentum; slow down, especially on the lowering phase.
Variations
- Standard one-arm band curl (arm tight to the torso): a more traditional angle that's easier to keep strict
- Two-arm resistance band curl: bilateral version that trains both sides simultaneously for efficiency
- Cable single-arm curl: gym-machine alternative with constant tension along a fixed path
- Standing dumbbell curl: free-weight version without the band's variable resistance curve
Tips for Progression
- Move to a heavier band once you can complete 12-15 controlled reps per arm
- Add a one-second pause at the top of each rep to increase time under tension
- Slow the eccentric to 3 seconds to add difficulty without changing the band
- Progress to fully single-arm free-weight curls once band strength has improved
Training Notes
Use the one arm biceps side curl with resistance band 2-3 times per week as part of an arm-focused or full-body accessory block. Perform 3 sets of 10-12 reps per arm, resting 45-60 seconds between sets. Its portability makes it a practical option for home workouts or as a supplemental exercise when traveling without access to weights.