Swimming is one of the best activities for cardiovascular health and overall fitness. The American Red Cross offers these tips for water safety:

• If you don't know how to swim, learn. The Red Cross offers classes for people of any age and level of ability.
• Always swim with a buddy, - not alone.
• Swim in supervised areas only.
• Don't mix alcohol and swimming. Alcohol impairs your judgment, balance and coordination. It also reduces your body's ability to stay warm.
• Pay attention to local weather conditions and forecasts. Stop swimming at the first indication of bad weather.
• If you have your own pool, post CPR instructions in the pool area, and keep a cordless phone handy for use in an emergency.
• Keep basic lifesaving equipment by the pool, including a pole, rope and personal flotation devices. Know how to use them.

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Source:  American Red Cross. Health & Safety Tips: water safety tips.