Swimming is a terrific way to beat the heat while also getting in some cardio and strength training, but don't allow the sight of bright blue water overpower your better sense. Not all swimming scenarios are made equal, and some might even end up in the emergency room if you're not careful. For example: It's common for people to dive under water to avoid being hit by a ball or flying bat; this behavior is called "diving" and is considered an athletic activity rather than swimming. People who don't know any better may think this is what swimmers do all day long when in fact they're just working out harder songs that require fewer strokes. The best way to stay safe while swimming is to learn the rules of the sport first and then exercise caution at all times. For example: If you're new to diving, start off with shallow dives until you gain more experience and confidence. Also, let someone know where you're going and when you'll be back. Blue water can be dangerous if you have any form of epilepsy or if you were diagnosed with cancer during or after treatment. The color blue has been known to trigger seizures in people who have not been diagnosed with epilepsy, so if this is a concern for you, look for another activity. Finally, remember not to swim alone! It may not seem like it, but swimming in a group is much safer than swimming solo.