The Nautilus HumanSport Arm Crunch is a highly versatile, selectorized strength machine engineered for natural, standing-based core and arm training. Designed without a traditional seat, this machine encourages upright movement patterns that feel intuitive and customizable, making it ideal for performance-focused facilities and high-traffic commercial gyms.

Adjustable lumbar pads provide stabilization during abdominal movements, allowing users to generate powerful, controlled crunching motions while maintaining proper alignment. The cable-based design supports multiple arm curling variations—including pronated, supinated, and hammer curls—expanding the machine’s functionality beyond traditional core training. Abdominal crunch straps can also be used for overhead triceps extensions, further increasing exercise variety.

Dual weight stacks operate on a smooth 2:1 pulley ratio and support both unilateral and bilateral training. Assisted adjustments with a gas-assist shock make setup quick and user-friendly, ensuring seamless transitions between exercises and users.

Specifications & Features

• Standing arm crunch and functional training machine

• Seat-free design for upright, natural movement patterns

• Adjustable lumbar pads for abdominal stabilization

• Supports multiple arm curl variations: pronated, supinated, and hammer curls

• Crunch straps double for overhead triceps extensions

• Unilateral or bilateral user-defined training

• Assisted adjustments with gas-assist shock

• Dual selectorized weight stacks

• Pulley ratio: 2:1

• Stack weight: 2 × 88 lbs

• Dimensions (L × W × H): 43" × 39" × 68"

• Machine weight: 655 lbs