For adults, the CDC recommends at least 2 hours and 30 minutes of moderate-intensity aerobic activity and two, or more, days of muscle training per week. However, not everyone meets those standards. This is what happens to your body when you go from regularly exercise to none at all.

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Source: http://www.thisisinsider.com/your-body-when-you-stop-exercising-workout-health-fitness-2017-7

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