First workout, You may feel more alert and energized., Day after, You may experience delayed onset muscle soreness., Next few weeks, Production of mitochondria begins to increase., 6–8 weeks, The number of mitochondria may increase by up to 50 %., 6 months, Changes in muscle shape become noticeable for people doing strength training., 9 months, VO₂ max may increase by approximately 25%., 1 year, Bones become denser., Long term, Exercise may benefit both your body and your bank account.

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