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Electromyography (EMG) is used to measure both physical (such as gait) and physiological activities (such as muscle diseases), as can be seen in Section 3.3. It represents the electrical potentials of neurons within the muscles and can be recorded using surface electrodes or by wires or needles inserted into the selected muscle of a lower extremity [34]. An understanding of muscle activity in gait can be obtained by processing the EMG signals. EMG provides feasibility of analysing relative contribution of the superficial muscles during movement. It records the activity of underlying motor units and plays an important role in clinical gait analysis for assessing walking performance of the people with gait impairments using muscle activity information, such as timing of the muscle activity and muscle strength.