A training module with Butterfly arms designed for Pec Deck and Reverse Pec Deck movements. It allows you to train the chest, rear deltoids, and upper back through a stable, repeatable range of motion.

The construction works in both seated and standing positions. It supports the classic Chest Fly movement, as well as variations focused on the rear shoulder area, so the training is not limited only to the chest muscles.

Exercises you can perform with the Butterfly arms:

• Pec Deck / Chest Fly (seated) – a classic seated chest fly movement focused on the chest muscles, performed with controlled motion and stable support.
• Reverse Pec Deck / Rear Delt Fly – targets the rear deltoids and upper back muscles, helping improve shoulder balance and posture.
• Standing Chest Fly – standing flyes that allow you to strongly emphasize the chest squeeze.
• Single-arm variation – allows you to train each side individually, which can help address differences in strength or movement control.

Muscle groups: the exercises primarily engage the chest and pectoral muscles, while reverse variations also target the rear deltoids, upper back, and shoulder-girdle stabilizing muscles.