Experience core training revolutionized with the Nautilus One™ Abdominal Crunch machine, where cutting-edge engineering meets the purest abdominal isolation. This modern reinvention of the legendary Nautilus "clamshell" design delivers unprecedented abdominal engagement through its intelligent 4-bar linkage system and patented dial technology.

TRUE AB CRUNCH MECHANICS

The dual movement arms recreate the perfect abdominal crunch motion, combining upper and lower torso movement for complete core activation. Our 4-bar linkage system creates a moving axis that follows your spine's natural thoracic rotation.

PATENTED DIAL SELECTION

Instantly set your perfect resistance with the revolutionary dial weight system. Choose from 5-lb increments on the 250-lb weight stack, with optional 1-lb micro-adjustments for precision core training.

BIOMECHANICAL PRECISION

The upper arm's moving axis perfectly matches your spine's natural curvature throughout the entire range of motion. This provides constant proper muscle loading while eliminating neck and back strain.

MODERNIZED CLASSIC DESIGN

Building on Nautilus' legendary abdominal technology, this machine enhances the original "clamshell" concept with contemporary engineering for superior comfort and effectiveness.

COMMERCIAL-GRADE CONSTRUCTION

Built to withstand constant gym use with heavy-duty steel construction and minimal wear components. The streamlined design ensures years of reliable performance with minimal maintenance.

ERGONOMIC COMFORT

Padded supports and contoured surfaces provide exceptional comfort during intense abdominal workouts. The movement path feels completely natural from start to finish.

Dimensions: W: 55" (140 cm) | L: 53" (135 cm) | H: 59" (150 cm) Weight Stack: 250 lbs (125 kg) standard Machine Weight: 760 lbs (345 kg) | Shipping Weight: 869 lbs (394 kg) SKU: S6AB

The Nautilus One™ Abdominal Crunch redefines core training by combining biomechanical precision with revolutionary resistance technology. Deliver the ultimate abdominal workout that targets muscles with surgical precision while protecting the spine - a true evolution in core training.