Primal Performance Series Plate Loaded Leg Extension

The Primal Performance Series Plate Loaded Leg Extension is a commercial quad isolation machine with a bell crank lever, made for gyms, PT studios and performance centres that want a leg extension without a weight stack. It runs on 50 mm Olympic plates, needs 1470 × 1420 mm of floor space and is only 1100 mm tall.

The bell crank changes the resistance through the rep, so the load feels lighter where the quads are weakest and heavier where they are strongest. Users get a hard contraction at the top without grinding through a sticking point at the start.

Who it is for

• Commercial gyms adding a plate loaded leg line
• PT studios that want a low profile quad machine clients can use on their own
• Performance centres running knee extension work for athletes
• Facilities with heavier users, with a 300 kg maximum user weight

Key features

• Bell crank lever system gives a variable resistance curve matched to quad strength through the range
• Motion path aligned to natural knee joint movement for a comfortable, consistent stroke
• Plate loaded, so load goes as high as your plates allow with no stack to service
• 300 kg maximum user weight for a wide range of members
• Heavy duty steel frame with a matte black paint finish for high traffic floors
• Low 1100 mm height that keeps sight lines open across the gym floor

Muscles worked and training uses

A leg extension trains knee extension with the hips fixed, which isolates the quads far more than squats or presses do.

• Primary: quadriceps, including the rectus femoris and vastus muscles
• Secondary: minimal, as the seat and pad keep the hips and trunk out of the lift
• Pre exhaust sets before squats or leg press
• Hypertrophy finishers with slow lowering and pauses at the top
• Quad strength work for athletes where knee extension is a priority
• Warm ups before heavy lower body sessions

Specifications

Frequently asked questions

What floor area does the Plate Loaded Leg Extension take up?

It measures 1470 mm long, 1420 mm wide and 1100 mm high. With about 600 mm of clearance on each side for plate loading and access, set aside a zone of roughly 2.7 × 2.6 m.

How do you load it?

Slide 50 mm Olympic plates onto the lever horn. Plates are sold separately. There is no weight stack, so the top load is set by the plates you have.

Will it fit under a low ceiling?

Easily. The machine is 1100 mm tall and the leg moves out in front of the seat, not overhead, so any normal ceiling works.

Is there a user weight limit?

Yes. It is rated for users up to 300 kg, which covers the vast majority of gym members.

What does the warranty cover?

Primal Strength states a full commercial use warranty of 5 years on the frame, 2 years on parts (labour not included), and 1 year on pads and wearables.

Do you deliver and install in Australia?

Yes. We ship Australia-wide from our Melbourne warehouse, and most metro deliveries arrive 1 to 7 business days after dispatch. The machine weighs 219 kg packed, so heavy items going to some regional addresses need a freight quote. Use the Ask about this machine form on this page and we will quote delivery and installation for your site.

Building a plate loaded leg line? Pair the Leg Extension with a Primal leg press and hack squat for a full lower body setup.