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hiit (high-intensity interval training),recognized by the world as a healthy and efficient fat-reducing method, which can help people burn fat quickly in a short period of time. after completing a set of hiit, your metabolism can be rapidly increased within 48 hours. it passes through the body noninvasively and interacts with motoneurons. motoneurons then trigger large muscle contractions due to action potentials. the brain transmits information to stimulate motoneurons. for these high-speed frequent contractions will lead to muscle strengthening. energy penetrates deeper muscle tissue through pre-designed procedures designed for different body parts and different purposes, enhancing stimulation and training the muscle..syi