Jammer arms (often referred to as lever arms) are heavy-duty, rack-mounted attachments designed to bring plate-loaded machine movements directly into your Riot Modular Rack.
By pivoting around a secure, fixed point on your uprights, jammer arms create a smooth, guided movement arc. This offers a middle ground between traditional free-weight movements (like barbells or dumbbells) and standalone plate-loaded machines, allowing you to perform controlled pressing, pulling, and explosive power work without taking up additional floor space in your home gym or facility.
Setting Up Jammer Arms Correctly
Getting the most out of your jammer arms comes down to four primary adjustments: mounting height, starting angle, handle attachment, and foot positioning.
1.Mount at the correct height:Sets the primary movement plane.
For horizontal chest pressing, position the pivot points near mid-chest level. Move them higher up the uprights for overhead pressing, or drop them lower for rows and belt squats.
2.Adjust the starting angle:Controls range of motion and resistance profile.
Fine-tune the angle stopper or pin setting so the movement begins at a comfortable stretch point without overextending your joints.
3.Attach your chosen handles:Determines grip orientation.
Secure your preferred grip attachment (e.g., Multi-Grip, ISO Bar, or Straightbar) using quick-release locking pins and verify that all connections are fast and tight.
4.Dial in your stance with light weight:Establishes stability.
Perform a warm-up set with minimal resistance to ensure your foot placement supports a smooth path through the movement arc.
Core Jammer Arm Exercises
1. Jammer Arm Chest Press
Set the arms at mid-torso height. Step forward into a staggered or even stance and drive the handles forward along their natural arc.
Setup Tip: A wider neutral grip reduces shoulder strain, while an inline grip mirrors a traditional bench press movement pattern.
2. Overhead Shoulder Press
Position the mounting points higher up your uprights. Facing towards or away from the rack, press the levers upwards and slightly forward.
Primary Target: Deltoids, upper chest, triceps.
Setup Tip: Focus on keeping your core braced to avoid leaning back excessively during the lockout phase.
3. Jammer Arm Row
Lower the attachment point towards the bottom of your rack uprights. Hinge at the hips with a flat back and pull the handles dynamically towards your ribcage.
Setup Tip: Experiment with different handle angles to shift focus between the upper back and lower lats.
4. Unilateral Pressing & Pulling
Using independent ISO handles allows you to work one side at a time. Unilateral work helps address strength asymmetries between sides while significantly increasing core anti-rotation demands.
Choosing the Right Jammer Arm Attachments
Different handle configurations allow a single pair of lever arms to target various muscle groups:
Allows some landmine movements to be added to the rack set up.
Are Jammer Arms Worth It for Your Gym Setup?
Jammer arms are ideal if you want to expand your training variation without buying separate fixed machines. They allow you to add chest presses, shoulder presses, rows, and functional movements directly onto your existing power rack.
For home gym owners working with limited space, jammer arms turn a Riot Modular Rack into a versatile, plate-loaded strength station.
Frequently Asked Questions
What muscles do jammer arms target?
Target muscles depend entirely on the movement. Pressing exercises target the chest, shoulders, and triceps, while rowing variations work the lats, traps, and upper back. Unilateral variations add significant core engagement.
Can I use standard Olympic weight plates on jammer arms?
Yes, as long as your jammer arms are fitted with standard 50mm (2-inch) weight loading sleeves, you can load standard Olympic bumper plates or cast iron plates.
What is the difference between lever arms and jammer arms?
"Lever arms" and "jammer arms" are synonymous terms in the strength industry. "Jammer arms" originally referred to explosive athletic training gear, but today both terms refer to rack-mounted pivoting arms used for various presses, pulls, and squat variations.
