BodyKore GR643 Leg Extension/Leg Prone

Leg Extension Machine—BodyKore GR643 Leg Extension/Leg Prone

A leg extension machine should deliver repeatable lower-body isolation that you can progress safely and confidently. The BodyKore GR643 combines two cornerstone movements—leg extension and lying prone leg curl—into one selectorized, commercial-grade station.

Built for premium home gyms and high-traffic facilities, the GR643 solves one problem: training quads and hamstrings efficiently without sacrificing fit, comfort, or floor space.

Why this Leg Extension Machine earns its space

Direct answer: The GR643 replaces two stations with one dual-function unit.

You get:

• Faster transitions between movements
• One selectorized stack for rapid load changes
• Consistent setup for cleaner progression tracking

This is especially valuable when space is limited and your programming calls for both quad and hamstring isolation in the same week.

Two movements, one selectorized station

Direct answer: You can train quadriceps and hamstrings without leaving the machine.

Leg extensions bias the quadriceps through knee extension, while prone leg curls load the hamstrings through knee flexion. Together, they support balanced lower-body training for strength, hypertrophy, and performance—without extra setup time.

The conversion is designed to feel natural. The back pad adjusts to the lying-down position while the seat pad tilts upward for a comfortable prone setup, helping you move from quad work to hamstring work with minimal interruption. Multiple starting positions help you find a strong, repeatable range of motion.

Dialed-in fit, alignment, and comfort

Direct answer: Multiple adjustments help you align the pivot with your knee and keep contact points comfortable across user sizes.

Fit drives results. When the machine fits, reps feel smoother, and bracing improves. The GR643 supports real-world repeatability with:

• 4-position seat adjustment for the leg extension
• 4 leg-pad length adjustments for both leg extension and prone work
• Angled pads and an ideal pivot location to support alignment
• Side and front handles for stability during hard sets

Voice-search setup cue: “How do I set up a leg extension machine?” Align your knee with the pivot, place the roller just above your ankle, then test one slow rep before loading heavier.

Leg Extension Machine specifications

Direct answer: These specs are taken directly from your provided product description.

• Dimensions: 61" x 44" x 65"
• Weight: 507 lbs
• Footprint: 24 sq ft
• Frame: Rolled Steel Oval Tubing
• Frame Color: Black or Silver
• Weight Stack: 220 lbs (upgradeable to 340 lbs)
• Rated Capacity: Commercial grade, rated to hold over 1000 lbs

How to train with the GR643

Direct answer: Pair extensions and prone curls in the same session, then progress reps or load while keeping setup and tempo consistent.

A simple progression rule: keep form strict, then add 1–2 reps per set or move the selector pin up one increment once you can hit the top of your rep range with control. For comfort and better tension, use a steady tempo (no bouncing) and finish most sets with 1–2 reps in reserve.

Ready-to-run templates

Strength-focused (progress load)

• Leg extension: 4 × 6–8
• Prone leg curl: 4 × 6–8
• Rest 90–120 sec; brace hard on handles

Hypertrophy-focused (build volume)

• Leg extension: 3–4 × 10–15
• Prone leg curl: 3–4 × 10–15
• Add a slow lowering phase on the last set

Recovery-friendly (control first)

• 2–3 × 12–20 each movement
• Conservative load, smooth tempo
• If training for rehab/recovery, coordinate with a qualified clinician

Key features (luxury-driven, performance-first)

Direct answer: The GR643 is designed to feel precise in motion, fast to adjust, and stable under serious training.

✅ Dual-function extension + prone curl
✅ Smooth selectorized weight changes
✅ 220 lb stack; upgrade to 340 lb
✅ Angled pads for strong contraction
✅ Ideal pivot location for alignment
✅ 4-position leg extension seat
✅ 4 leg-pad length adjustments
✅ Back pad converts to prone setup
✅ Seat pad tilts for comfort
✅ Adjustable leg roller
✅ Side and front handles for bracing
✅ Cup/phone/key holder
✅ Multiple starting positions

People also ask

Is a leg extension machine good for quads?
Yes—leg extensions directly load the quadriceps when your knee is aligned with the pivot and your tempo stays controlled.

What muscles do prone leg curls work?
Primarily the hamstrings, through knee flexion, which complements quad training for balanced development.

How do I reduce knee discomfort on leg extensions?
Lower the load, align the pivot with your knee, keep the pad just above the ankle, and avoid bouncing at the ends of the range.

Can I superset leg extensions and curls on this machine?
Yes—the combo design supports quick transitions so you can keep training density high.

Is this suitable for home gyms?
If you have the space and want commercial-grade stability, it can replace two separate stations with one premium centerpiece.

Buy with confidence from Tennessee, ship nationwide

Direct answer: You can get a tailored quote and USA-wide delivery support from a Tennessee-based team.

For long-term performance, follow the owner’s manual for routine inspection, cleaning, and hardware checks.

Explore ordering options through Hamilton Home Fitness and secure a refined lower-body station built to serve home training, studios, and commercial floors alike.

Manuals

Leg Extension/Leg Prone GR643

Data Sheets

Leg Extension/Leg Prone GR643