Resistance training is imperative for overall health and well-being in humans. This modality of exercise is not only popular for maintaining a healthy lifestyle but is also sought after by athletes for increased performance and patients with mobility impairments for locomotion therapy. However, resistance training equipment can be inaccessible for both humans on earth and space, where gravity independent and vibration isolated equipment can combat muscle loss in astronauts. TREB (tunable resistive exercise bellows) resistance training device leverages pneumatic resistance for gravity independent resistance-based training in a compact, lightweight device compared to traditional resistance exercise equipment, like free-weights and weighted machines. This work demonstrates the modeling and performance characterization of the expected resistive behavior for quick, interchangeable pneumatic resistors to tune TREBs resistive output. Furthermore, a suite of TREB exercises are proposed that contribute to both resistive exercises for enhanced muscular conditioning and other rehabilitative and assistive applications.