The fourth annual hydration challenge, part of Live Healthy Iowa, began this week. This “Burst Your Thirst” challenge is the third lifestyle challenge of the year and focuses on hydration and physical activity for six weeks with chances to win prizes. Participants track their water consumption and physical activity online. This is the fourth year of the challenge, last year over 5,000 Iowans took part and recorded 8.8 million ounces of water consumer and logged nearly 11 million minutes of physical activity. Registration for teams of two to 10 people is still open at www.livehealthyiowa.org.