The Primal Performance Series Dual Seated Leg Extension/Leg Curl is a commercial pin loaded machine that trains the quads and hamstrings from one seat, with a 125 kg weight stack. It fits in 1160 × 1050 mm of floor space at 1630 mm high, giving smaller floors both knee isolation exercises without two separate machines.

Each movement runs on its own stack ratio, matched to how strength changes through that exercise, so the load feels right from the first degree of the lift to the last.

Who it is for

• PT studios that need quad and hamstring isolation in a compact footprint
• Commercial gyms adding extra leg stations to a busy lower body area
• Strength and conditioning facilities building knee and hamstring resilience in athletes
• Rehab focused programs where controlled, seated knee work matters

Key features

• Leg extension and seated leg curl in one unit, switched with a quick adjustment
• Dual stack ratios: 2:1 for the leg curl and 1:1.4 for the leg extension, to suit each strength curve
• Multi hinge adjustments that line the knee up with the pivot for a full range of motion
• 125 kg pin select stack for fast load changes
• 3 mm laser cut steel frame with a matte black electro powder coat
• 1000 kg rated cables and urethane injection moulded pads with double stitched, customisable covers
• Laser cut metal frame shrouds to keep users clear of moving parts

Muscles worked and training uses

The extension straightens the knee against the shin pad to load the front of the thigh, and the seated curl bends the knee to load the back of the thigh, both with the hips fixed in the seat.

• Primary: quadriceps (leg extension) and hamstrings (seated leg curl)
• Secondary: calves (gastrocnemius) during the curl and hip flexors for stability
• Pre exhaust or finisher work around squats and leg presses
• Hamstring strength work to support sprint and injury prevention programs
• Knee rehab progressions with light starting loads and a controlled path

Specifications

Frequently asked questions

What footprint does the dual leg extension and leg curl need?

The machine measures 1160 mm long, 1050 mm wide and 1630 mm high. Leave about 600 mm clear around it for access, so plan for a zone of roughly 2.4 × 2.3 m.

How does the weight stack work on each exercise?

A 125 kg pin select stack drives both movements. The leg curl runs at a 2:1 ratio and the leg extension at 1:1.4, so the resistance suits each exercise.

Does it need a high ceiling?

No. It is 1630 mm tall and all movement happens at seat level, so a standard 2.4 m ceiling is plenty.

What warranty does Primal provide?

It carries Primal Strength's full commercial use warranty: 5 years on the frame, 3 years on parts, 1 year on pads, cables, pulleys and wearables, and 1 year labour.

Can it be delivered and installed in Australia?

Yes. We ship Australia-wide from our Melbourne warehouse, and most metro deliveries land 1 to 7 business days after dispatch. It is 325 kg packed, so some regional addresses need a freight quote. Use the Ask about this machine form on this page for a delivery and installation quote.

Should I buy a dual unit or separate leg extension and leg curl machines?

A dual unit saves space and cost for studios and smaller gyms. Large, busy gyms where both exercises are in constant use often prefer separate machines so two members can train at once.

Pair it with the Primal Seated Leg Press and Dual Adductor/Abductor for a complete selectorised lower body line.