If you are not physically fit for snorkeling then you may experience a cramp in your calf muscles. You can treat that by stretching or trying to relax your leg muscles. You should wear a life jacket at all times while you are in water. You should also wear a wetsuit in cold water to keep your body heat in. EAR stands for expired air resuscitation. That is a technique all divers should know how to do. It is when you breathe air into their lungs to keep them breathing. You can even do this while towing them into the side of the pool.