How Much Water Should You Drink on a 20km Run?
                                
                                
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                                    4 min read                                
                            
                                According to sports science, even a 2% loss in body weight from dehydration can lead to a noticeable drop in athletic performance. Determining how much water you need for a 20km run is a personal calculation, not a one-size-fits-all rule, influenced by your unique physiology and environmental conditions.