How to Use an Arm Blaster for Bicep Curls
By Gym Equipment | Built to Work | Home & Commercial | NORTHERN | Published: 2026-10-26
Category: How-to Guides
Learn how to use an arm blaster to isolate your biceps, improve curl form, and avoid common mistakes. Perfect for home gym workouts with cables or dumbbells.
Quick answer
An arm blaster locks your elbows in place so you can't cheat during bicep curls, forcing your biceps to do all the work. Use it with dumbbells, a barbell, or a cable machine for stricter, more effective curls.
Why use an arm blaster instead of regular curls
Without an arm blaster, it's easy to let your elbows drift forward or your shoulders take over, reducing bicep activation. The arm blaster keeps your upper arms fixed against your torso, eliminating momentum and forcing your biceps to contract fully through every rep. This makes it especially useful if you've hit a plateau or struggle with form during heavy curls.
Arm blaster vs. cable attachments for back work
While the arm blaster is purpose-built for isolation, a tool like the Northern Angled Lat Pulldown Bar – Narrow Grip targets the back from a different angle. The angled arms shift work onto the inner lats and mid-back, making it a better choice for pull-ups or lat pulldowns. If you're building a home gym, both serve distinct roles: the arm blaster for arm day, the lat pulldown bar for back day.
How to use an arm blaster for bicep curls
- Step 1: Position the arm blaster: Slide your arms through the padded straps so the curved plate rests against your chest and your elbows sit snugly against the pads. Adjust the straps so your upper arms are held firmly in place, parallel to each other and perpendicular to the floor. Common mistake: Straps too loose let your elbows drift, defeating the purpose. Tighten until your arms cannot move forward.
- Step 2: Choose your weight and grip: Hold a dumbbell, barbell, or cable handle with an underhand (supinated) grip, hands shoulder-width apart. Start with a lighter weight than your usual curl because the isolation makes every rep harder. Checkpoint: If you feel your lower back arching, the weight is too heavy. Drop down until you can keep your torso still.
- Step 3: Perform the curl: Keeping your elbows pinned to the pads, exhale and curl the weight toward your shoulders. Squeeze your biceps at the top for one second, then lower the weight under control until your arms are nearly straight. Do not let the weight touch down between reps. Common mistake: Lowering too fast or letting the weight rest at the bottom removes tension from the biceps. Keep the movement smooth and continuous.
- Step 4: Control your breathing and tempo: Inhale as you lower the weight (2–3 seconds) and exhale as you curl (1–2 seconds). A slower tempo increases time under tension and forces your biceps to work harder without adding weight. Checkpoint: If you find yourself holding your breath, slow down the rep speed until you can breathe rhythmically.
- Step 5: Finish with a static hold or drop set: On your last set, hold the weight at the midpoint of the curl for 10–15 seconds, or immediately reduce the weight by 20–30% and continue until failure. This extends the set without needing a spotter. Common mistake: Stopping as soon as you feel fatigue. The arm blaster keeps you safe to push past failure with lighter weight.
Products mentioned in this guide
- Arm Blaster: The Northern Arm Blaster Fitness Curl Support Isolator locks your elbows in place and isolates your biceps to ensure stricter form and better focus. This eliminates the ability to swing or use momentum, so your biceps get the full stimulus from every rep.
Arm Blaster - Angled Lat Pulldown Bar - Narrow Grip: The Northern Angled Lat Pulldown Bar – Narrow Grip has steep, narrow angled arms that bring your hands in close and low, shifting work onto the inner lats and mid-back. It complements the arm blaster by giving you a dedicated tool for back work, so you can train opposing muscle groups with proper equipment.
Angled Lat Pulldown Bar - Narrow Grip
