Hoist Fitness Ab Crunch/Low Back HD-3600

Hoist HD-3600 Ab Crunch Machine for Sale

The Hoist HD-3600 is a selectorized ab crunch machine that also trains the low back. It loads trunk flexion and extension from one seated position, which suits home gyms, training studios and light-commercial floors that need both core directions covered by a single station and one weight stack.

• Exercises—Ab crunch and low back
• Resistance—Selectorized weight stack
• Builds offered—Standard HD or heavy HDG
• Frame line—Hoist HD Dual Series
• Ordering — Private invoice only
• Best fit—One seated core station

What the HD-3600 Trains

It trains the trunk in two opposite directions from the same seat. A bi-directional press-arm allows for back and abs exercises in one machine, so you crunch forward against resistance, then work extension from the same position without moving to another station.

That matters more than it sounds, because "back extension" names two different exercises in this market. The hyperextension benches and Roman chairs you see for a few hundred dollars put you face down over a thigh pad and load the movement with your own torso—the work happens mainly at the hips. The HD-3600 sits you upright with the pelvis parked against the seat and loads the movement from a weight stack instead.

Is a seated back extension the same as a hyperextension? No. On a bench, your hips do most of the hinging, and your bodyweight sets the load. On this frame the seat holds your hips still, and the pin sets the load, so the two are different exercises that happen to share a name. Shoppers comparing a $300 bench against a commercial station are usually comparing prices for two different things.

Choose the HD-3600 if you want the trunk loaded from a seat. If what you actually want is the hip hinge, a hyperextension bench does that job for a fraction of the price and this machine is the wrong purchase. Browse the wider selectorized ab machines collection if you are still deciding which movement your room is missing.

Setting It Up for Your Body

Set the machine in a fixed order and every session repeats the same way. The seat carries a numbered decal, so once you find your position you never guess it again.

1. Pick your seat number and write it down.
2. Set the range of motion for the exercise you are doing.
3. Place your feet on the pegs or the flat pads.
4. Load the pin last, once the fit is right.

Hoist publishes no count for the range-of-motion positions or the foot placements, only that both are adjustable on both exercises. That is worth knowing before you order if you are outfitting a room where several people need documented settings.

Key Features

✅ One seat covers flexion and extension.
✅ Hips stay parked while the trunk works.
✅ Enclosed stack, no plates to store
✅ Numbered seat settings repeat exactly.
✅ Two factory builds for different rooms
✅ Upholstery wiped down after each use
✅ Low frame keeps the room open.
✅ Made by a San Diego strength brand
✅ Full parts list published by Hoist
✅ Sold through an authorized dealer
✅ Ships nationwide from Tennessee

Choosing Your Stack Build

Decide this before you order, because the stack is fitted during assembly rather than added later. The HD-3600 ships as a standard HD build or a heavy-stack HDG build, and a 5 lb upgrade kit can be specified on either one.

Which build should you order, HD or HDG? Order the heavy stack if trained lifters will use the low back exercise regularly, since that side of the machine carries the higher load. The standard build is enough for most home rooms and for facilities where the station is used for general core work rather than heavy loading. Hoist's own documentation prints its resistance chart for the standard stack only.

Ready to move? Add the HD-3600 to your cart and specify the build when the order is confirmed.

Full Specifications

Size and footprint

• Product length — 48.00" (122 cm)
• Product width—49.25" (125 cm)
• Product height—55.00" (140 cm)

Standard HD build

• Weight stack — 180 lbs. (82 kg)
• Machine weight — 505 lbs. (229 kg)
• Stack with add-on — 185 lbs. (84 kg)
• Weight with add-on — 517 lbs. (235 kg)

Heavy stack HDG build

• Weight stack — 215 lbs. (98 kg)
• Machine weight — 538 lbs. (244 kg)
• Stack with add-on — 220 lbs. (100 kg)
• Weight with add-on — 550 lbs. (249 kg)

Adjustments and options

• Seat pad positions — Seven, for user height
• Range of motion — Multiple points, both exercises
• Foot pegs — Angled, multiple placements
• Foot pads — Horizontal, multiple placements
• Optional upgrade — 5 lbs. weight upgrade
• Upgrade part code — RS-CAGE-NG-OPT1

Warranty and ordering

• SKU—HD-3600
• Coverage — Original purchaser only
• Covers — Workmanship and materials
• Scope — Manufacturer defects only
• Specifications—Subject to change by Hoist

Hoist positions this as one of the strongest warranty policies in the industry, and the full schedule is published in the brand's own warranty document rather than on the listing.

Who It Suits, Who Should Skip

This is a station for rooms that want trunk training handled properly in one place. It is not a general core solution and it does not try to be.

A good fit for:

• Home gyms wanting a supported core station
• Studios training clients of varied heights
• Hotel and apartment rooms under 50 users daily
• Buyers who want low back work with real load

Look elsewhere if:

• You want the hip hinge, not seated extension
• Your budget favors a bench over a stack
• You need a published user weight limit
• You want decline or floor-based ab work

Hoist publishes no maximum user weight for this frame in the inputs, on the listing, in the spec sheet or in the owner's manual. That is a real gap on a page where competing listings headline 330 lb to 500 lb ratings, and it is worth raising with the team before you commit if capacity is a facility requirement.

HD-3600 vs. Other AB/Back Combos

Three stations on this site cover the same two exercises at three price points. The honest fork is how much resistance you want and whether you want room to add more later.

Hoist HD-3600

• Price—$3,960.00
• Weight stack—Two builds offered
• Product line — Hoist HD Dual Series
• Choose it when — You want a Hoist frame

BodyKore GR637

• Price — $3,299.00
• Weight stack — 220 lbs.
• Product line — BodyKore commercial
• Choose it when — You want upgrade headroom

Body-Solid S2ABBX

• Price — $2,315.00
• Weight stack — 160 lbs.
• Product line — Pro ClubLine Series 2
• Choose it when — Budget leads the call

The BodyKore GR637 combo is the closest match on footprint and takes an upgrade to a larger stack, which the Hoist does not. The Body-Solid S2ABBX ab and back is the entry point. If you would rather have a dedicated ab station and no extension at all, the Hoist Abdominals RS-2601 and the Club Line CL-3601 sit above this one in the same range.

Getting It Delivered and Installed

Plan the placement once, because this frame is meant to stay where you put it. Hoist instructs owners to bolt the unit to the exercise floor using minimum 4-1/2" bolts to prevent tipping, and warns that skipping it can cause serious injury.

Assembly calls for two people, a ratchet wrench with 1/2", 9/16" and 3/4" sockets, an adjustable wrench, a rubber mallet, a tape measure, a level and a hex key set, plus a squareness check once the frame is together. Hoist supplies no crate dimensions for this model, so confirm freight measurements with the team before you plan a doorway route.

Hoist equipment at Hamilton Home Fitness is handled as a private invoice, and the brand sits outside the free-shipping list that covers several others in the commercial gym equipment range. Review the shipping and returns terms before ordering, since equipment used beyond testing is not eligible for return.

Ab Crunch Machine FAQs

How much resistance actually reaches you on each exercise?

Hoist's owner's manual prints a weight ratios page showing the ab crunch at 50% of the selected stack and the low back exercise at 80%. On the standard build that puts the top of the ab range near 90 lbs and the top of the back range near 144 lbs. The chart covers the standard stack only.

Is the range of motion adjustable for both exercises?

Yes, and Hoist confirms it in both the listing and its own spec sheet. What the brand does not publish is how many positions each control offers, so treat it as adjustable rather than countable when comparing against machines that advertise a number.

What does the Hoist warranty actually cover?

The HD line falls under Hoist's commercial and light commercial terms: ten years on the frame and body, five on structural moving parts, three on pulleys, bearings and bushings, and one year on cables, upholstery, grips and coatings. Light commercial means a facility charging no membership dues with no more than 50 users a day.

Can one person put it together?

No. Hoist specifies two people for assembly and cross-references its weight cage manual partway through the build. Professional installation is worth pricing if nobody on site is comfortable with a squareness check.

How much floor space should I allow around it?

Allow clearance behind the seat for entry and exit, plus room to reach the stack pin, on top of the frame dimensions listed above. The station is lower than most in its class, which helps in basements and rooms with sightline limits.

Does it come with a maintenance schedule?

Yes. Hoist publishes separate home and commercial schedules covering upholstery cleaning, decal and hardware inspection, cable and belt checks, and lubrication intervals. Ammonia, acid-based and petroleum-based solvents should never be used on the finish.

Get the trunk covered in both directions from one station, ordered in the build that matches your room. Speak to the team or book a gym design consultation if the HD-3600 is going into a wider floor plan, or explore the full Hoist Fitness range to see where it sits alongside the rest of the line. Every order ships from Tennessee with authorized dealer support behind it.

Manual

Warranty

Brochure

Spec Sheet