7. Swimming
Swimming is a terrific low-impact activity, especially if you have problems with your joints when walking or running. Begin with single-stroke laps (the freestyle is great for newbies). Add more as you feel ready, such as the breaststroke, backstroke, or butterfly (for more advanced swimmers). Rest as needed in between laps, and never swim alone or without a lifeguard. Do it twice a week for 10–30 minutes. Each week, try to add 5 minutes to your workout.
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