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The Nautilus Nitro Plus Lower Back is a full range, lumbar-isolated machine that emulates the function of rotation around multiple vertebrae. Four-bar linkage provides a moving axis of rotation that simulates the body’s moving axis of rotation, increasing user safety by eliminating sheer forces on the spine, and a contoured lower back pad allows full range extension.

The Nautilus Nitro Plus line is a compact, durable, and ergonomic line of variable resistance selectorized strength machines designed to adapt to the way the body moves for more efficient performance and quicker results. Nautilus Nitro Plus equipment utilizes Optimal Strength Curve Technology, which ensures smooth resistance and correct muscle recruitment through the entire movement, as well as dynamically matches the user’s strength curve through a patented four-bar linkage mechanism and converging axis movements. The partially shielded weight stacks are seat-accessible and bright yellow adjustment knobs are easy to identify and user-friendly. The Nautilus Nitro Pus line offers the same functionality and technology as Nautilus Nitro machines, but the upgraded appearance and special enhancements will definitely attract attention.

A Nautilus Nitro Plus Lower Back is, and can best be described as follows: A Back Extension, or Low Back Extension, is a plate-loaded or selectorized piece of fitness equipment designed to work the muscles of the Lower Back during strength training. The user is in a seated position and lifts the loaded or selected weight by pushing against a back pad while extending the spine.