Details

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The Onyx Series from Extreme Fitness represents the next evolution in strength equipment — designed for athletes who demand smooth mechanics, premium aesthetics, and commercial-grade performance in every rep.

Built to isolate and overload both your quads and hamstrings, this dual-function machine combines Seated Leg Extension and Seated Leg Curl into one compact, heavy-duty unit. Every detail has been optimized for biomechanics, comfort, and adjustability, making it a perfect addition to commercial gyms or elite home setups.

Key Features

Dual Function Design: Train both quadriceps and hamstrings with seamless transitions between leg extensions and seated curls.

Massive 120 kg / 264 lb Weight Stack (1:1 Pulley Ratio): Delivers true, consistent resistance through the entire range of motion.

Enhanced Frame Geometry: Recessed front crossmember increases range at the start of the extension and finish of the curl.

Ergonomic Pad Positioning: Redesigned thigh and back pads provide a more secure, natural movement path — optimized for users from 4'10" to 6'10".

Multiple Adjustment Points:

9 roller arm positions

5 leg roller height settings

8 thigh pad lock positions

Adjustable back pad for perfect alignment on every rep

Laser-Engraved Numbering: Quick, repeatable setup for consistent training sessions.

Textured Rubber Grips: Added control and comfort during heavy loads.

Performance & Build Quality

The Onyx Series features precision pulleys, reinforced cables, and a smooth resistance profile that delivers an authentic commercial-gym feel. The seat angle and linkage system have been refined to increase range of motion for both exercises, giving maximum muscle activation and control.

Compact & Commercial-Ready

Despite its versatility and power, the Onyx Series Leg Curl & Extension has a compact footprint — ideal for home gyms, studios, or full-scale training facilities. Every component is finished in a deep matte-black powder coat, embodying the stealth-luxury style of the Onyx Series.