When you’ve been drinking, everything from your reaction times to your muscle development can suffer, and the effects can last from anywhere from a few hours up to three full days.  Alcohol consumption has a negative impact on fitness, as it can affect the body in several ways:

In summary, alcohol consumption can have a negative impact on fitness by causing dehydration, impeding muscle growth, impairing recovery, increasing calorie intake, and decreasing endurance. To optimize fitness results, it is recommended to limit alcohol consumption or avoid it altogether.