GFT100 vs S2FTX: Which Dual-Stack Functional Trainer Do You Need?

The GFT100 and S2FTX are both dual-stack functional trainers, not a single-stack versus dual-stack comparison. Choose the GFT100 if your ceiling is a standard eight feet and daily use is light to moderate, since it delivers the same two-stack, two-user setup for roughly half the price per pound. Choose the S2FTX only if you need Body-Solid's full commercial duty rating for a high-traffic paid gym floor and your ceiling clears at least eight and a half feet.

Quick decision summary

• Best for home gyms, hotels, corporate wellness rooms, and PT studios: the GFT100. It has the same two independent stacks and two-user capability as the S2FTX, at roughly half the cost per pound of stack weight.
• Best for busy commercial gym floors, schools, and sports programs: the S2FTX. Body-Solid rates it full commercial, built for the wear a public, paid-membership floor puts on a machine.
• Best value per pound of stack capacity: the GFT100. At every matching stack size, it carries the identical combined plate weight for about half the S2FTX's price.
• Skip the S2FTX if your ceiling is under about eight and a half feet. The frame alone stands eight feet three inches.
• Choose the S2FTX when your facility needs the full commercial duty rating and warranty, not more stack weight or more simultaneous users, since both machines already offer two independent stacks.

What a single-stack functional trainer is

A single-stack functional trainer uses one weight stack and one pulley column, sometimes mounted to a wall or bolted onto a rack instead of standing as its own frame. It costs less and takes up less floor space than a two-stack unit, and it works fine for one person training cable exercises at a time.

The tradeoff is capacity. With only one stack, a second person cannot load a different weight and train the same machine at once. They wait, or they use something else.

The rest of this article compares two dual-stack machines, the GFT100 and the S2FTX, rather than a single-stack option against a dual-stack one.

GFT100 vs S2FTX: spec comparison

Spec	GFT100 (light commercial)	S2FTX (full commercial)
Weight stack setup	Two independent stacks, two towers	Two independent stacks, two towers
Simultaneous users	2	2
Stack size options (per tower)	160, 210, or 310 lb	160, 210, or 310 lb
Combined plate weight (both towers)	320, 420, or 620 lb	320, 420, or 620 lb
Resistance felt at the handle	About 80, 105, or 155 lb, documented 1:2 cable ratio	Not published by Body-Solid
Pulley positions	Full-height adjustable and swiveling; exact count not published	34 starting heights per column, columns 63 in. apart
Weight stack shrouds	Sold separately (GFT100SH)	Fully shrouded, standard
Footprint	45"L x 64"W x 83"H	54"L x 79"W x 99"H
Ceiling needed	About 7 ft. 6 in. clears the frame; 8 ft. or more for the chinning bar	About 8 ft. 6 in. or more; frame alone is 8 ft. 3 in.
Duty rating	Light commercial	Full commercial (Pro ClubLine)
Warranty, commercial use	Lifetime frame and welds; 3 yr pulleys, bushings, bearings, hardware; 1 yr cables, upholstery, grips	Lifetime frame and welds; 3 yr pulleys, bushings, bearings, hardware, plates, guide rods; 1 yr cables, upholstery, grips
Starting price (160 lb. tier)	$2,200–$2,400	$4,900–$5,500

Prices above are shown as ranges rather than a single exact figure because list prices move. Whatever stack size you pick, the gap between the two machines stays close to about $2,900. It runs from about $2,890 at the 210 lb. tier to about $2,925 at the 310 lb. tier.

GFT100 — dual stack

S2FTX — dual stack

What actually separates the two machines

The GFT100 and S2FTX are not a single-stack machine and a dual-stack machine. Both use two independent weight stacks and two pulley columns, and both let two people train different exercises on the same frame at the same time.

The real difference is duty rating. Body-Solid rates the GFT100 light commercial, suited to homes, hotels, apartment gyms, corporate wellness rooms, and personal training studios. It rates the S2FTX full commercial, built for the wear a paid, high-traffic gym floor puts on a machine day after day.

Frame size follows the duty rating. The S2FTX is taller, wider, and deeper than the GFT100, and its 8 ft. 3 in. frame height is the single biggest reason a buyer might rule it out before ever comparing price.

Warranty depth follows the duty rating too. Both machines cover the frame and welds for life. But the S2FTX's 3-year tier extends to plates and guide rods, not just pulleys, bushings, bearings, and hardware, which matters more the more hours a day the machine actually runs.

One spec is honestly a wash between them, and one favors the GFT100 on information alone. Body-Solid documents the GFT100's 1:2 cable ratio and publishes the resulting per-handle resistance. It does not publish a per-handle figure for the S2FTX, so buyers comparing working load rather than stack size have a real number for one machine and none for the other.

The S2FTX also ships with its weight stacks fully shrouded, while the GFT100's stacks are exposed unless you add the separate GFT100SH shroud set. On an open commercial floor with members walking past both towers, that is a genuine safety and housekeeping difference, not just cosmetics.

Both machines are built on 11-gauge steel frames sized for commercial use. General fitness equipment sold commercially is expected to meet construction and structural requirements under ASTM F2276, Standard Specification for Fitness Equipment, and the U.S. Consumer Product Safety Commission tracks safety recalls across the exercise equipment category, including cable and selectorized machines.

Which one fits your facility

• Home gym or garage gym: the GFT100. A standard eight foot ceiling clears it, and the home warranty covers the frame, pulleys, plates, cables, and grips for life.
• Hotels, apartment fitness rooms, and corporate wellness rooms: the GFT100. Body-Solid rates it specifically for this tier of light commercial use.
• Personal training and boutique studios: the GFT100 for most studios. Move up to the S2FTX only if the floor runs back-to-back clients for most of the business day and the ceiling allows it.
• Police and fire stations: either machine, depending on station size, ceiling height, and shift traffic. Both are rated for this market.
• Commercial gyms, health clubs, schools, universities, and sports programs: the S2FTX. Full commercial duty rating and the deeper warranty tier are built for that traffic.
• Multi-location buyer on a fixed budget: two GFT100 units across two locations often serve more total members than one S2FTX in a single location, for close to the same total spend.

Both live in our Functional Trainers collection, alongside the Power Cage w/ Cable Crossover if you also want free-weight rack training in the mix. See our functional trainer vs cable crossover guide for that comparison.

Space, delivery, and installation

The GFT100's frame is 45 in. front to back by 64 in. wide. In practice, plan on roughly 10 ft. by 8 ft. of clear floor, since the pulleys swivel and the cables reach well past the towers for flyes and lateral work.

The S2FTX's frame is 54 in. deep by 79 in. wide, close to 30 sq. ft. Plan on about 4 ft. of clear space on each side so a lifter can step back and run a full cable path without crowding the next station.

Both machines arrive by LTL freight with curbside delivery and a liftgate. Someone needs to be there to sign for the shipment and help move the crates from the curb.

Assembly is a full day either way. The GFT100 is a two-person job running 4 to 6 hours. The S2FTX is heavier still, and Body-Solid recommends a third person just to stand the columns up. Many commercial buyers hire a local installer for the S2FTX rather than assign it to staff.

Same stack sizes, same user count: what the price gap actually buys

This is WorkoutHealthy's own calculation, not an industry-standard metric. Since both machines offer identical stack size options and identical combined plate weight at every tier, dividing price by combined stack weight shows what a buyer is really paying for.

At the base 160 lb. tier, both machines carry 320 lb. of plates total across their two stacks. The GFT100 works out to roughly $7 to $8 per pound of that combined weight. The S2FTX works out to roughly $15 to $17 per pound, a little more than double.

That gap is not paying for more stack weight or a second user. Both machines already have two stacks and support two people. It is paying for the full commercial duty rating, the larger frame, the standard shrouding, and the deeper warranty tier.

The gap narrows some at larger stack sizes using the real unconverted prices at each tier, running a little over double at the smallest stack size and closer to double at the largest. It never closes, but it is not fixed either.

WorkoutHealthy's view is that this changes the real question a buyer should ask. It is not whether the S2FTX is overpriced for a second stack, since the GFT100 already has one. It is whether your facility's daily use actually needs the full commercial duty rating the extra spend buys.

A simple rule: if daily use is light to moderate and a standard eight foot ceiling works for your space, the GFT100 gives you the identical two-stack, two-user setup for close to half the price per pound at every size. If paid members are on the machine most hours of most days and your ceiling clears it, the S2FTX's full commercial rating is what that spend is actually buying.

Final recommendation

Buy the GFT100 if your ceiling is a standard eight feet and your daily traffic is light to moderate. It gives you the same two independent stacks and two-user capability as the S2FTX for roughly half the price per pound of stack weight.

Buy the S2FTX if you are running a paid, high-traffic gym floor and your ceiling clears at least eight and a half feet. The extra spend goes toward Body-Solid's full commercial duty rating and deeper warranty, not more stack weight or an extra user.

Compare the GFT100 and S2FTX product pages directly, or ask WorkoutHealthy to help verify your ceiling height and traffic before you order.

Frequently asked questions

Are the GFT100 and S2FTX both dual-stack functional trainers?

Yes. Both use two independent weight stacks and two pulley columns, so two people can train different exercises on the same frame at once. What separates them is duty rating, size, and price, not stack count.

What is a single-stack functional trainer?

A single-stack functional trainer uses one weight stack and one pulley column, so only one person can load and train it at a time. The GFT100 and S2FTX covered in this guide are both two-stack machines, built so two people can train different exercises at once.

If both machines have two stacks, what actually separates the GFT100 and S2FTX?

Duty rating, footprint, and warranty depth. The GFT100 is rated light commercial and fits under a standard eight foot ceiling. The S2FTX is rated full commercial, stands over eight feet tall, and carries a deeper warranty tier built for continuous paid gym floor use.

How much ceiling height do I need for each machine?

The GFT100's frame clears a seven and a half foot ceiling, with eight feet or more recommended if anyone will use the integrated chinning bar. The S2FTX's frame alone stands eight feet three inches, so plan on at least eight and a half feet of clearance.

What warranty does each machine carry?

The GFT100 carries Body-Solid's light commercial warranty: lifetime on the frame and welds, three years on pulleys, bushings, bearings, and hardware, and one year on cables, upholstery, and grips. The S2FTX carries the full commercial warranty, which extends the three-year tier to plates and guide rods as well.

Can I upgrade the stack size on either machine later?

No. Each stack size is a separate factory configuration on both machines, and neither is designed to be retrofitted with more plates after purchase. Order the size you will still want in a few years.

Still not sure which fits your space? Compare the GFT100 and S2FTX product pages, or browse the full Functional Trainers collection.

References and Sources

• ASTM International. F2276-10(2015), Standard Specification for Fitness Equipment.
• U.S. Consumer Product Safety Commission. Exercise Equipment recalls and safety information.