TKO Ab / Low Back

The 8804 trains the rectus abdominis via forward crunch and the erector spinae via back extension — the two opposing core muscle groups that control spinal flexion and extension. Training both in one station prevents the imbalances that develop when users focus on ab training without corresponding lower back work, which is a leading contributor to postural issues and lower back pain in regular gym users.

The 4-position arm adjustment sets the range of motion and pre-stretch for both ab crunch and back extension — allowing users to customize the starting position to match their torso length, flexibility, and injury history. Pull-pin adjustment is quick and tool-free, keeping transitions between exercises and between users fast in commercial environments where the machine sees high daily turnover.

At 41" × 43" × 60", the 8804 is the smallest machine in the TKO Achieve Dual lineup — replacing two separate core training stations in a footprint smaller than most single selectorized machines. This makes it the obvious choice for facilities with limited floor space that still need to offer complete core training: hotels, apartment gyms, corporate wellness centers, and personal training studios.

5mm aircraft-spec American LOOS cables rated to 2,000 lb breaking strength with end fittings tested to 250,000 full-stack cycles run through glass fiber reinforced nylon pulleys with a deep V-groove for secure cable seating. The same premium cable system used across the entire TKO Achieve Dual series ensures consistent, smooth resistance through every rep of both core movements.

The 170 lb selectorized weight stack is fully enclosed in a protective rear shroud, keeping plates and guide rods safe from user contact and environmental wear while maintaining a professional appearance. Simple step-by-step instruction placards on the machine make setup self-service for both exercises — no staff assistance required for new users to get positioned correctly and training safely.

Electro-welded 2.5–2.75mm heavy-gauge steel tubing with a graphite powder coat finish and 70mm thick foam padding with high-use black upholstery match the construction standard of the rest of the Achieve Dual series. At 389 lb, the 8804 is the lightest machine in the lineup — structurally solid without the bulk, making it practical to position in almost any available floor space.