The GCAB-STK Pro Select Ab & Back machine is engineered to provide efficient dual-function training—targeting both the abdominal and lower-back musculature in one compact unit. With adjustable settings and a heavy-duty frame, this machine suits both home gyms and light commercial settings.
Single station, dual focus
You can work your abs and lower back by simply reversing your seated motion—no complicated re-positioning or equipment swapping required.
Cam-guided resistance with 20 angle settings
The pop-pin cam offers twenty selectable arm positions, allowing you to tailor the path to fit your range of motion or flexibility level.
Seven-position leg pad brace
Adjustable foot brace isolates your lower body while you move through a full range of motion for both crunches and extensions.
Ergonomic, durable padding
The contoured seat and back pads are upholstered in thick DuraFirm foam designed for repeated use and durability.
Commercial-grade steel frame
Built on 2" × 4" 11-gauge steel tubing and precision-welded for stability and durability. Despite its rugged build, it fits into tighter spaces.
Start seated, adjust the leg pad and foot brace, select your cam angle, then perform either an abdominal crunch or a back extension from the same seat. The motion arm moves on a roughly 30° arc while the seat is angled to promote natural biomechanics. Labels and pop-pins are positioned for ease of adjustment while seated.
GCAB-STK machine with fully adjustable cam and pivot arm
Ultra-thick upholstered seat and backrest
Seven-position leg brace and footplate block
Sectorized weight stack (210 lb standard, 310 lb optional)
Illustrated placard with setup guidance and workout modes
Assembly tools and manual included
Frame: 2" × 4" 11-gauge structural steel (light commercial rating)
Assembled weight: ~399 lb
Footprint: approximately 55″ length × 50″ width × 71″ height
Sectorized weight stack (210 lb standard, 310 lb optional)
Cam positions: 20 selectable angles, leg brace: 7 height settings
Upholstery: DuraFirm high-density foam
Do I need to move the machine to switch from abs to back exercises?
No. You remain seated and reverse the motion direction. The adjustable cam arm is designed for both movements.
Do I need to load free plates for resistance?
No — The machine uses a sectorized weight stack. You simply insert the pin to select your resistance (210 lb standard, upgradeable to 310 lb).
Is it easy for different users to adjust?
Yes—seat height, cam position, and leg pad can all be adjusted while seated using secure pop-pins. No tools needed during use.
Can this go in a home gym?
Yes. Though built to commercial standards, its 55″ × 50″ footprint allows placement in many home training spaces.
Is it designed for repeated use?
Yes. The DuraFirm padding and angled seat design are intended to support frequent workouts and multiple users.
Frame & Welds: Lifetime coverage
Pulleys, Bushings, Bearings, Hardware, Plates, Guide Rods: Lifetime coverage
Cables, Upholstery, Grips: Lifetime coverage (normal wear applies)
Frame & Welds: Lifetime coverage
Pulleys, Bushings, Bearings, Hardware: 3 years
Cables, Upholstery, Grips, Other Components: 1 year
Free Shipping: We offer free shipping on all outbound orders.
Return shipping costs are the customer’s responsibility unless the item is defective or incorrect. Please view our Return Policy for more information
Delivery Area: We currently ship within the United States
Processing Time: Orders are processed within 1-3 business days, Monday to Friday.
Cut-off Time: Orders placed before 5:00 pm Central Standard Time begin processing time the same business day. Orders after will begin processing the next business day
No Shipping Days: Orders are not processed on weekends or public holidays.
Estimated Shipping Times: Orders typically arrive within 1-7 business days (Monday-Friday) after processing, depending on the destination.
For Products ordered under 150lbs
Delivered to your doorstep or driveway
Transit time: 1–7 business days
Tracking number provided
For large/heavy items (150+ lbs)
Delivered curbside with a liftgate
Appointment and adult signature required
Products are not brought inside or upstairs
Orders are processed within 1–3 business days (Monday–Friday).
Orders placed before 5:00 pm CST begin processed the same business day; those placed after begin processing the next business day.
Orders are not processed on weekends or public holidays.
Orders arrive within 1–7 business days (Monday–Friday) after processing, depending on destination.
Total timeline: 2–10 business days from the date you place your order.
For full details, please see our Shipping Policy
Return Period: 30 days from delivery date.
Refund Processing: Within 10 business days from receipt.
Return Shipping: Covered by the customer unless the product is defective or incorrect.
Restocking Fees: We do not charge restocking fees.
For full details, please see our Return & Refund Policy
Shipping is available to all 50 U.S. states, including Alaska and Hawaii. We do not ship International
We accept the following methods:
For details, please see our Payment Policy
You can reach our customer service team
sales@primal-fitness.shop
+1 (615) 568-8943
Mon-Sat: 9AM - 5PM CST
Live Chat: On the bottom right of your screen, you can reach out to one of our support agents during business hours
The GCAB-STK Pro Select Ab & Back machine is engineered to provide efficient dual-function training—targeting both the abdominal and lower-back musculature in one compact unit. With adjustable settings and a heavy-duty frame, this machine suits both home gyms and light commercial settings.
Single station, dual focus
You can work your abs and lower back by simply reversing your seated motion—no complicated re-positioning or equipment swapping required.
Cam-guided resistance with 20 angle settings
The pop-pin cam offers twenty selectable arm positions, allowing you to tailor the path to fit your range of motion or flexibility level.
Seven-position leg pad brace
Adjustable foot brace isolates your lower body while you move through a full range of motion for both crunches and extensions.
Ergonomic, durable padding
The contoured seat and back pads are upholstered in thick DuraFirm foam designed for repeated use and durability.
Commercial-grade steel frame
Built on 2" × 4" 11-gauge steel tubing and precision-welded for stability and durability. Despite its rugged build, it fits into tighter spaces.
Start seated, adjust the leg pad and foot brace, select your cam angle, then perform either an abdominal crunch or a back extension from the same seat. The motion arm moves on a roughly 30° arc while the seat is angled to promote natural biomechanics. Labels and pop-pins are positioned for ease of adjustment while seated.
GCAB-STK machine with fully adjustable cam and pivot arm
Ultra-thick upholstered seat and backrest
Seven-position leg brace and footplate block
Sectorized weight stack (210 lb standard, 310 lb optional)
Illustrated placard with setup guidance and workout modes
Assembly tools and manual included
Frame: 2" × 4" 11-gauge structural steel (light commercial rating)
Assembled weight: ~399 lb
Footprint: approximately 55″ length × 50″ width × 71″ height
Sectorized weight stack (210 lb standard, 310 lb optional)
Cam positions: 20 selectable angles, leg brace: 7 height settings
Upholstery: DuraFirm high-density foam
Do I need to move the machine to switch from abs to back exercises?
No. You remain seated and reverse the motion direction. The adjustable cam arm is designed for both movements.
Do I need to load free plates for resistance?
No — The machine uses a sectorized weight stack. You simply insert the pin to select your resistance (210 lb standard, upgradeable to 310 lb).
Is it easy for different users to adjust?
Yes—seat height, cam position, and leg pad can all be adjusted while seated using secure pop-pins. No tools needed during use.
Can this go in a home gym?
Yes. Though built to commercial standards, its 55″ × 50″ footprint allows placement in many home training spaces.
Is it designed for repeated use?
Yes. The DuraFirm padding and angled seat design are intended to support frequent workouts and multiple users.
Frame & Welds: Lifetime coverage
Pulleys, Bushings, Bearings, Hardware, Plates, Guide Rods: Lifetime coverage
Cables, Upholstery, Grips: Lifetime coverage (normal wear applies)
Frame & Welds: Lifetime coverage
Pulleys, Bushings, Bearings, Hardware: 3 years
Cables, Upholstery, Grips, Other Components: 1 year
Free Shipping: We offer free shipping on all outbound orders.
Return shipping costs are the customer’s responsibility unless the item is defective or incorrect. Please view our Return Policy for more information
Delivery Area: We currently ship within the United States
Processing Time: Orders are processed within 1-3 business days, Monday to Friday.
Cut-off Time: Orders placed before 5:00 pm Central Standard Time begin processing time the same business day. Orders after will begin processing the next business day
No Shipping Days: Orders are not processed on weekends or public holidays.
Estimated Shipping Times: Orders typically arrive within 1-7 business days (Monday-Friday) after processing, depending on the destination.
For Products ordered under 150lbs
Delivered to your doorstep or driveway
Transit time: 1–7 business days
Tracking number provided
For large/heavy items (150+ lbs)
Delivered curbside with a liftgate
Appointment and adult signature required
Products are not brought inside or upstairs
