About BTL Industries. Founded in 1993, BTL Industries is a privately owned developer and manufacturer of medical and aesthetic equipment. BTL currently has over 900 employees and direct offices in more than 51 countries. BTL Aesthetics, a division of BTL, has revolutionized the way to non-invasively remove adipose tissue; it currently ranks 2nd among the non-invasive body shaping and tightening manufacturers globally.
A Well-Defined Chest Routine. 1  1. Do exercises that work the whole chest such as pushups, barbell bench presses, dumbbell bench presses, dumbbell flyes and cable flyes. Perform these exercises to trigger muscle fibers throughout your pectoral muscles and get an all-around stronger, more defined chest.
Strong Shoulders. The spring chest expander works the deltoids as the primary muscle for the movement. There are three primary sections to your deltoids, or shoulder muscles, anterior or front, middle and posterior or back.road Back. The basic exercise of the spring chest expander also engages the upper back muscles. The pulling action requires the upper back to engage. To get more back flexion out of this exercise, squeeze your shoulder blades toward each other as you pull the chest expander outward.