Drinking plenty of water can help boost your metabolism, but water also helps with preventing muscle cramps, which allows you to train longer and harder. (fitnessandpower.com)
Indeed, one study concluded that the primary cause of muscle cramps during exercise in warm weather was sodium deficit. (mindbodygreen.com)
A potassium deficiency can cause muscle cramps, fatigue and constipation. (healthyeating.sfgate.com)