Beach volleyball is an extremely popular sport, he says. Even if the section of the beach is relatively level and free of holes, there can still be problems. If you are going to play beach volleyball, there is really no way to prevent such injuries, so be careful about your landings. No matter what sport you play, exercising in the sun can be extremely dehydrating, Maharam says. Particularly dangerous can be drinking beer or other alcoholic beverages while playing sports in the sun, Maharam says.
Alcoholic drinks are diuretics, meaning that they encourage the loss of fluid.
Besides adequate hydration, another universal precaution is the use of sunscreen, says Bruce Katz, MD, director of the JUVA Skin and Laser Center in New York City and an associate clinical professor of dermatology at Columbia University College of Physicians and Surgeons, also in New York. They are getting as much sun as people who are tanning because they are getting sun exposure from above and sun exposure from below because the sun reflects off of the sand. As a rule of thumb, if you perspire heavily or swim a lot, reapply sunscreen every 40 minutes. And, sunscreen should contain either zinc oxide, titanium dioxide, or parsol because these blockers block out both UVA and UVB rays. The sun's ultraviolet rays are the main culprit of skin cancer.