Onyx Leg Extension / Hamstring Curl — Built Without Compromise. Two of the most effective lower body exercises. One precision-engineered machine. The Onyx Leg Extension / Hamstring Curl delivers isolated quad and hamstring training in a single, space-efficient unit — built to the same commercial standard you expect from every piece of Onyx equipment. Whether you're equipping a boutique studio or a high-performance commercial facility, this is the machine your members will keep coming back to. Why Choose the Onyx Leg Extension / Hamstring Curl? Two Machines. One Footprint. Switch seamlessly between leg extension and hamstring curl movements without taking up double the floor space. Smart design for serious facilities. 100kg Weight Stack A generous 100kg weight stack ensures the machine caters to all fitness levels — from rehabilitation and beginners right through to advanced athletes. Commercial-Grade Build Constructed from heavy-duty steel with a premium black powder coat finish, the Onyx Leg Extension / Hamstring Curl is engineered to handle the demands of high-traffic training environments day after day. Precision Movement, Every Rep Designed for smooth, consistent resistance throughout the full range of motion — so your members get the most out of every set.