Arm Blaster for Bicep and Tricep Workouts: How It Works and Whether You Need One
The arm blaster is a piece of training equipment that has been around since the golden era of bodybuilding and is still used by serious arm trainers today. It is a curved aluminum or steel plate worn around the neck and resting against the torso, with cut-outs on each side that brace the upper arms in a fixed position during barbell and dumbbell curl movements. The basic premise is simple: eliminate cheating, enforce strict form, and isolate the biceps more completely than free curls allow.
This guide covers exactly what the arm blaster does mechanically, which exercises benefit from it, how to use it correctly, and how it compares to the preacher curl as the alternative strict curl option.
What the Arm Blaster Does Mechanically
In a standard standing barbell curl, the most common form breakdown involves swinging the torso back to help initiate the movement, allowing the elbows to drift forward as the weight rises, and using shoulder flexion to assist at the top of the range. Each of these compensations reduces the load on the biceps and transfers it to the lower back, anterior deltoid, and shoulder flexors.
The arm blaster prevents all of these compensations simultaneously. The metal plate presses against the torso and pins the upper arms against the body. The elbows are fixed in position by the brace cutouts on each side. Elbow drift forward is mechanically blocked. Shoulder swing is resisted by the rigid plate against the torso. The only movement that can occur is elbow flexion, which is the movement that loads the biceps.
The result is a stricter curl than most athletes can achieve through willpower and attention alone. The biceps are isolated not because the athlete is focusing hard on them but because the equipment makes any other muscle involvement structurally impossible.
How the Arm Blaster Compares to Preacher Curls
Both the arm blaster and the preacher curl pad serve the same function: bracing the upper arm to prevent cheating and enforce strict elbow flexion. The mechanical difference is in the position of the brace.
The preacher curl pad braces the upper arm in front of the body, angled slightly forward. This places the bicep in a stretched position at the bottom of the curl and reduces the mechanical advantage of the muscle at the start of the movement. The preacher curl is harder at the bottom and easier at the top.
The arm blaster pins the upper arms at the sides of the body in a more vertical position. This is the same position as a standing strict curl, which means the bicep is challenged more evenly across the full range of motion compared to the preacher. At the top of the arm blaster curl, the bicep is still under significant load. At the top of a preacher curl, the load drops off substantially.
Neither is strictly superior. They create different stimulus profiles. The preacher emphasizes the stretch position. The arm blaster emphasizes the full-range strict contraction. Using both over a training block covers both ends of the bicep stimulus spectrum.
How to Use the Arm Blaster Correctly
Hang the arm blaster around the neck so the metal plate rests against the upper abdomen, roughly at solar plexus height. Adjust the neck strap so the plate sits at a height where your upper arms can rest comfortably in the brace cutouts when the elbows are at the sides.
Stand upright with the torso tall. Place both upper arms into the brace cutouts. Grip the barbell with a shoulder-width supinated grip. The elbows should be resting in the cutouts with the forearms hanging at roughly 45 degrees in the starting position.
Curl the bar upward by flexing the elbows only. The upper arms should remain stationary against the brace throughout the full range of motion. Squeeze hard at the top, then lower with control through the full eccentric range. Do not allow the bar to drop quickly on the descent.
Exercises That Work with the Arm Blaster
Barbell Curl
The classic arm blaster exercise. A straight barbell or EZ-bar curl performed in the brace. Shoulder-width grip for maximum bicep activation. Full range from full extension to full flexion with a peak contraction hold at the top. Three to four sets of 8 to 12 repetitions is the standard protocol for mass development.
Dumbbell Curl
Dumbbells can be used in the arm blaster with each arm working independently. The freedom of the dumbbell allows wrist supination through the range of motion, which increases the recruitment of the bicep short head and the brachialis compared to a fixed-bar supinated grip. Three sets of 10 to 12 repetitions per arm.
Hammer Curl
A neutral-grip hammer curl performed in the arm blaster trains the brachialis and brachioradialis as primary movers. The brachialis is a key contributor to overall arm thickness that lies under the bicep and contributes to the appearance of arm size when developed. Strict hammer curls in the arm blaster remove the momentum that typically makes the brachialis work less than intended in free-standing hammer curls.
Programming the Arm Blaster in a Workout
The arm blaster is most effectively used as a secondary exercise after a heavier free curl movement rather than as the primary bicep exercise. Heavy barbell curls or heavy dumbbell curls performed without the brace allow more load and develop the raw strength base. The arm blaster then follows as a strict isolation movement that targets the biceps through the quality of contraction rather than the quantity of load.
A standard arm training sequence might run: heavy standing barbell curl for 4 sets of 6 to 8 repetitions, then arm blaster strict curl for 3 sets of 10 to 12 repetitions, then a finishing exercise such as concentration curls or cable curls for 2 sets of 12 to 15 repetitions. The arm blaster occupies the middle position in the sequence where form is critical and weight is secondary to contraction quality.
The Genghis Fitness arm blaster for bicep and triceps is built from solid aluminum construction appropriate for consistent training use across a full lifting career.
Can You Use the Arm Blaster for Triceps
The arm blaster is primarily a bicep tool but it can be adapted for certain tricep exercises. Overhead tricep extensions with a dumbbell can be performed while wearing the arm blaster, with the brace helping to keep the elbows pointing upward rather than flaring outward. The bracing effect is less decisive for tricep exercises than for curls because the most common tricep cheat (elbow flare) is only partially corrected by the arm blaster’s upper arm brace.
For strict tricep training, skull crushers, close-grip bench press, and cable pushdowns already enforce reasonably strict mechanics through the nature of the movement and the body position. The arm blaster adds less to tricep training than it does to curl training where upper arm drift is the primary form breakdown.
Common Arm Blaster Mistakes
- Setting the plate too low so the upper arms sit above the brace cutouts and the arms can still drift during the curl.
- Using the same weight as for free curls. Arm blaster curls are harder at equivalent weights because cheating is removed. Reduce the load by 10 to 20 percent initially.
- Allowing the head to drop forward to look at the bar. Keep the chin up and the cervical spine neutral throughout.
- Skipping the eccentric. Lowering with control through the full extension range is where a significant portion of the growth stimulus comes from.
- Using the arm blaster for every curl set. Reserve it for the strict isolation phase. Heavy free curls still have a place in arm development.
Pairing with Wrist Wraps and Elbow Sleeves
Athletes with wrist discomfort during heavy barbell curls can use the Genghis Fitness wrist wraps for the heavier free curl sets that precede arm blaster work. The wrist wraps stabilize the joint under load. For athletes with elbow sensitivity from high-volume arm training, the Genghis Fitness reversible elbow sleeves provide compression and warmth at the elbow across the full arm session.