PCB Linear. Over the last several years, society has become more and more health conscious and the field of specialized fitness equipment has grown by leaps and bounds. Along with that growth has come the proliferation of various designs and configurations for both the equipment and the guide mechanisms. In today's market, the fastest growing segment of focused equipment is that designed to meet a woman's or senior's express needs for smooth consistent motion and feel. Specifically in this paper we will discuss the various components used in weight stack and fitness equipment applications and arrive at qualified solutions for the best system.