High-quality and complex anthropomorphic torso phantom. They are semi-solid in nature and constitute skin, subcutaneous fat, muscle, spinal column, visceral fat, and internal organ (heart). They are specifically designed to match real human athlete thorax cavity at 500 MHz - 20 GHz, UWB frequency. They can be used for Microwave/Ultrasound Imaging, Testbed for cardiac/pulmonary monitoring, and device development. They exhibit dielectric and mechanical stability over a long period of time. Non-toxic and benign in nature.