A wearable fitness device comprising a harness (16) made with a plurality of straps (10, 12, and 14) for covering an upper-
torso region (20) of a user A plurality of wirings connecting a plurality of sensors, including PPG sensors (24),
inductance Plethysmography sensors (26),
electrocardiography sensors (28) for single-Lead; positions not indicated for 6-Lead),
electromyography sensors (30), Inertial Measurement sensors (32) integrated into straps (10, 12, 14), with a
control unit (22) to analyze various physiological parameters of the user. A communication module (40) establishes a
wireless connection between a
user device and the
control unit (22) to transmit a result of the analysis of the parameters, to the
user device. A power source (42) powering the fitness device. An extension means configured between the sensors (24, 26, 28, 30, and 32) and
control unit (22) to allow the addition / extension of sensors / modules (24, 26, 28, 30, and 32) towards one or more body parts of the user.