Gronk Fitness Selectorized Dual Leg Extension/Curl

The Gronk Fitness Selectorized Dual Leg Extension/Curl is a dual-function lower-body strength machine designed for leg extensions, leg curls, quad training, hamstring development, and isolated lower-body strength work. Built for commercial gyms, training studios, athletic facilities, and serious home gym users, this selectorized leg machine combines two essential leg exercises into one efficient station.

With a solid steel frame, selectorized weight stack, adjustable seat and backrest, self-lubricated bushings, nylon-coated cables, sealed-bearing nylon pulleys, marine-grade double-stitched upholstery, and tinted front and rear weight shrouds, this machine is built for smooth movement, quick resistance changes, durable performance, and comfortable user positioning. Its compact dual-purpose design helps facilities train quadriceps and hamstrings without needing separate leg extension and leg curl machines.

Key Features

• Dual-function design supports both leg extension and leg curl exercises from one selectorized strength station.
• Targets the quadriceps and hamstrings for balanced lower-body strength development.
• Selectorized weight stack allows fast resistance changes without loading or unloading plates.
• Solid steel frame construction supports demanding commercial and home gym training environments.
• Self-lubricated bushings help maintain smooth movement and consistent feel through each repetition.
• Sealed-bearing nylon pulleys provide consistent cable tension and fluid motion during training.
• Nylon-coated cables improve durability and support smooth resistance delivery.
• Adjustable seat and backrest help users align properly for leg extension and leg curl movements.
• Marine-grade double-stitched upholstery improves comfort and long-term wear resistance.
• Tinted low-profile front and rear weight shrouds help protect the stack while giving the machine a clean commercial look.
• Rubber feet help protect flooring and reduce machine movement during use.
• Water bottle holder is included for added convenience in commercial and home training spaces.

Feature Highlights

• Dual Leg Extension and Curl Function: This machine combines quad-focused leg extensions and hamstring-focused leg curls in one footprint. The dual-function design saves floor space while giving users two key lower-body isolation movements for strength, hypertrophy, knee stability training, and balanced leg development.
• Selectorized Weight Stack: The integrated weight stack lets users change resistance quickly with a selector pin. This is ideal for personal training sessions, high-traffic gyms, circuit workouts, drop sets, and multi-user environments where fast setup and simple operation matter.
• Smooth Pulley and Cable System: Sealed-bearing nylon pulleys, nylon-coated cables, and self-lubricated bushings help deliver consistent motion throughout the exercise. Smooth resistance helps users maintain control, reduce jerky movement, and better isolate the target muscles.
• Adjustable Seat and Backrest: The adjustable positioning system helps accommodate different user heights and leg lengths. Proper setup improves alignment at the knee and hip, helping users train the quadriceps and hamstrings more effectively.
• Commercial-Ready Durability: Solid steel construction, anti-scratch electrostatic powder coating, tinted shrouds, rubber feet, and marine-grade double-stitched upholstery make the machine suitable for repeated use in professional fitness facilities and demanding home gyms.

Exercises

Use the Gronk Fitness Selectorized Dual Leg Extension/Curl for leg extensions, seated leg curls, quad isolation, hamstring isolation, knee-extension strength work, knee-flexion strength work, bodybuilding-style leg training, accessory work for squats and deadlifts, athletic lower-body programming, and balanced anterior and posterior leg development.

Who This Is For

This selectorized leg extension and leg curl machine is ideal for commercial gyms, personal training studios, school weight rooms, athletic performance facilities, rehabilitation-focused training spaces, and dedicated home gyms that need a durable lower-body strength machine for quad and hamstring isolation in a compact footprint.

Specifications

• Brand: Gronk Fitness
• SKU: 5405-G2
• UPC: 810143801552
• Product Type: Selectorized Dual Leg Extension and Leg Curl Machine
• Application: Commercial Gym, Training Studio, Athletic Facility, Dedicated Home Gym, Lower-Body Strength Training, and Selectorized Machine Training
• Exercise Focus: Quadriceps, Hamstrings, Leg Extensions, Leg Curls, Lower-Body Isolation, and Accessory Strength Training
• Resistance System: Selectorized Weight Stack
• Weight Stack: 200 lbs
• Weight Stack Components: 19 Weight Plates plus Top Weight Stack
• Frame Construction: Solid Steel
• Weight Construction: Solid Steel Machined Weights with Self-Lubricated Bushings
• Weight Selection: Aluminum Weight Stack Pin
• Pulley System: Sealed-Bearing Nylon Pulleys
• Cables: Nylon-Coated Cables
• Finish: Anti-Scratch Electrostatic Powder-Coated Finish
• Upholstery: Marine-Grade Double-Stitched Upholstery
• Weight Shrouds: Tinted Low-Profile Front and Rear Shrouds
• Seat: Adjustable Seat
• Backrest: Adjustable Backrest
• Feet: Rubber Feet for Floor Protection and Stability
• Accessory Included: Water Bottle Holder
• Dimensions: 66" L x 42" W x 62" H
• Product Weight: 560 lbs
• Assembly: Assembly Required

Warranty

Warranty Notice: Warranty coverage may vary by use classification and should be confirmed with the manufacturer’s current warranty policy at the time of purchase.

• Residential Warranty: Lifetime Frame
• Commercial Warranty: 10-Year Frame, 5-Year Parts, 6-Month Accessories, 2-Year Labor, and 1-Year Coating

Resources

• Gronk Fitness Selectorized Dual Leg Extension/Curl Manufacturer Product Page
• Gronk Fitness Selectorized Dual Leg Extension/Curl Assembly Manual
• Gronk Fitness Warranty Information
• Sell Sheet