Woman exercising

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Stress makes your body spew out two hormones: cortisol and adrenaline. These chemicals put your body into fight-or-flight mode, ratcheting up your energy level and causing your heart to pound and your muscles to tense. Exercise gives you an outlet to release some of that tension. A good workout also increases your levels of "feel-good" chemicals called endorphins.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.