Selectorized
Commercial Leg Extension Machines and Selectorized Leg Stations
A commercial leg extension machine has a member straighten the knees against a weight stack, which trains the quads, the large muscles along the front of the thigh. Its partner, the leg curl, bends the knees to work the hamstrings. This section covers weight-stack versions of both, combos that do both, and the inner and outer thigh machines beside them.
| Quick fact | Details |
|---|---|
| Machines covered | Leg extension, leg curl (seated, prone, standing), extension and curl combos, inner and outer thigh, all stack-loaded, with a pin to pick the weight |
| Makers we carry | Hoist, Body-Solid, Spirit Fitness, BodyKore and TAG Fitness, among others |
| Free shipping | Applies to the Body-Solid, Spirit Fitness and TAG Fitness machines in this group |
Want presses, or machines that take plates? Our leg presses for facilities and plate-loaded leg machines are separate groups. A few calf machines sit in this grid, and the full range is in our calf raise machines. Equipping a house or garage? See leg extension machines for home gyms.
Extension, Curl, Combo or Thigh: Which Machine Does Your Floor Need?
Start from the muscle group members ask for. The table lists one machine of each kind from our pages.
| Machine | Works | Example here | Listed on the page |
|---|---|---|---|
| Leg extension | Quadriceps | Hoist Fitness Club Line Leg Extension CL-3401 | 300 lb stack; L 61.25" x W 41.5" x H 48.5" |
| Leg curl, standing or prone | Hamstrings | Hoist Fitness Club Line Standing / Prone Leg Curl CL-3408 | 200 lb stack; L 62.75" x W 42.75" x H 48.5" |
| Extension and curl combo | Quadriceps and hamstrings | Hoist Fitness Leg Extension/Leg Curl HD-3400 | 215 lb stack; L 60.75" x W 48.75" x H 55" |
| Combo with switch from the seat | Quadriceps and hamstrings | Spirit Fitness CSD-LELC | 225 lb stack in 5 lb steps; rep counter |
| Inner and outer thigh | Hip adduction and abduction | Body-Solid Pro ClubLine S2IOTX | 160 lb stack, 235 lb upgrade; 7-position cam adjustment |
Single-purpose machines let one member train quads while another trains hamstrings. The Body-Solid Pro ClubLine S2LEX lists seven back pad positions and thirteen starting positions. The Hoist CL-3401 adds a gas-spring-assisted seat back, and the Hoist CL-3408 curls standing or prone, with one leg or both when lying.
Spirit says you can switch the CSD-LELC without leaving the seat, and Hoist lists eight back pad adjustments on the HD-3400. The Hoist Fitness Inner/Outer Thigh HD-3800 lists 69.5" x 61.75", a bigger footprint than the extension and curl machines above.
One Combo or Separate Machines? What Do the Footprints Say?
A combo saves floor space, and separate machines save waiting time. Hoist lists the CL-3401 extension at 61.25" x 41.5" and the CL-3408 curl at 62.75" x 42.75". Those two footprints add up to about 36 square feet. The HD-3400 combo lists 60.75" x 48.75", about 21 square feet.
The machines come from different Hoist lines and the CL-3408 is a standing and prone curl, so treat the gap as a rough guide and add walk-around room. Two machines keep both movements open at peak hours; a combo is enough when use is spread through the day. Our guide to leg extensions and leg curls explains the two movements, though it is written for home training.
Which Leg Machine Suits Your Facility?
The pairings below follow footprint, adjustment range and load steps. They are editorial picks, not statements from the makers:
| Facility | Suits | Example here |
|---|---|---|
| Apartment and multifamily gyms | One combo, one footprint | Hoist HD-3400 |
| Corporate offices, resorts | Back pad and start positions for many body sizes | Body-Solid S2LEX |
| Senior living, medical-center gyms | Seated switch, 5 lb load steps | Spirit CSD-LELC |
| Fire stations | A combo plus a thigh machine: four movements, two frames | Body-Solid S2LECX and S2IOTX |
| Schools, team rooms | Prone and standing curls | Hoist CL-3408 |
Check the warranty class too. Our S2IOTX page says Body-Solid rates it for full commercial use and lists the Full Commercial Warranty, as does the S2LEX page. Hoist's pages point to a general warranty document or its support page, so ask us which terms apply before you order.
Five Checks Before You Order a Leg Machine
- ✅ Stack weight and its upgrade: the HD-3400 lists 215 lb or a 240 lb heavy stack, the S2LEX 160 lb or 235 lb
- ✅ Back pad and starting positions for short and tall members
- ✅ A roller pad that adjusts or self-aligns, as the Hoist pages list
- ✅ Footprint with clearance: the Hoist machines above list lengths from 60.75 to 69.5 inches
- ✅ A warranty class that matches daily traffic
Size the stack for your strongest regular user, then check which upgrade each page offers.
Hoist publishes an HD-3400 spec sheet. Body-Solid's S2LEX data sheet lists 47"L x 52"W x 57"H and 419 lb, which our product page does not print.
Leg Extension and Curl Questions From Facility Buyers
What are the different leg curl machines?
Seated, prone and standing. A seated curl works from a chair, a prone curl from a pad you lie face down on, and a standing curl with the body upright. This grid has a Spirit seated curl (CSS-SLGC), BodyKore and Hoist prone curls, and the Hoist CL-3408.
Pick the position that suits your members and your floor.
Can a leg extension machine be used for leg curls?
Only if it is a combo. A single-purpose extension machine has no curl setup, so look for extension and curl in the name, as on the Spirit CSD-LELC and the Hoist HD-3400.
Check how the product page says you switch between them.
What are the weights on a leg extension machine?
Stack sizes vary by model. Examples here include 300 lb on the Hoist CL-3401, 225 lb in 5 lb steps on the Spirit CSD-LELC and 160 lb on the Body-Solid S2LEX, which has a 235 lb upgrade.
Most pages we checked do not print a maximum user weight, so ask us if your members are heavy.
Are leg extension machines good?
They are good at isolating the quadriceps along an adjustable, guided path. They do not replace squats or lunges, which train the hips and trunk too.
Members with knee pain or a past knee injury should ask a clinician before they use one.
Plan Your Leg Machine Floor
Building out a full gym? HHF Commercial Amenities (www.hhfcommercial.com) covers design and construction in the Chattanooga, Tennessee area. Individual leg machines ship from our Tennessee location to all 50 states. Installation is arranged through us, and outside Tennessee it is typically handled by certified regional partners. The 30-day return window covers undamaged equipment in its original packaging, and returns carry a 25% restocking fee plus return shipping.
Need a stack size confirmed, or a clearance checked against your floor plan? Just call or text 423-458-2453.
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