TETSUBarbell Thruster vs Machine Seated Reverse Fly (Parallel Grip)
The Barbell Thruster and the Machine Seated Reverse Fly (Parallel Grip) both train the delts as their primary muscle. The Barbell Thruster uses a barbell while the Machine Seated Reverse Fly (Parallel Grip) uses a machine. Here is how they compare and when to pick each.
Side-by-side comparison
| Barbell Thruster | Machine Seated Reverse Fly (Parallel Grip) | |
|---|---|---|
| Primary muscle | delts | delts |
| Body part | shoulders | shoulders |
| Supporting muscles | quadriceps, glutes, hamstrings and core | trapezius and rhomboids |
| Equipment | barbell | machine |
| Steps in our guide | 5 | 5 |
How each one starts
Barbell Thruster — first steps
- Start by standing with your feet shoulder-width apart, holding a barbell at shoulder height with an overhand grip.
- Lower into a squat position by bending your knees and pushing your hips back.
Machine Seated Reverse Fly (Parallel Grip) — first steps
- Adjust the seat height and position yourself on the machine with your chest against the pad and your feet flat on the floor.
- Grasp the handles with a parallel grip, palms facing each other, and keep your arms slightly bent.
Full step-by-step guides are linked below.
Which should you choose?
The Barbell Thruster lets you load the heaviest weights and progress in small, steady jumps. The Machine Seated Reverse Fly (Parallel Grip) fixes the movement path so you can push close to failure with less skill demand. If your gym has both options, neither is a wrong choice: pick the one that feels strongest through a full range, and swap after 6 to 8 weeks to keep the delts adapting.
Full form guides
Common questions
Is the Barbell Thruster better than the Machine Seated Reverse Fly (Parallel Grip)?
Neither is universally better — both train the delts as the primary mover. The Barbell Thruster lets you load the heaviest weights and progress in small, steady jumps, while the Machine Seated Reverse Fly (Parallel Grip) fixes the movement path so you can push close to failure with less skill demand. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Barbell Thruster and the Machine Seated Reverse Fly (Parallel Grip) in the same program?
Yes, but usually not in the same session — they overlap heavily on the delts. A common setup is one as your main movement and the other on a second training day, or alternating them block by block.
Do the Barbell Thruster and the Machine Seated Reverse Fly (Parallel Grip) work the same muscles?
The primary muscle is the same: the delts. Supporting muscles differ slightly — quadriceps, glutes, hamstrings and core for the Barbell Thruster versus trapezius and rhomboids for the Machine Seated Reverse Fly (Parallel Grip).
Track it in Tetsu
Tetsu tracks both movements separately, keeps your PRs per exercise, and tells you which one is actually progressing. Free to start.