Once your ear piercing has healed up you should take earrings off for sports, but if you're still healing earring covers for sports are a good option.
Gun & Stud Ear Piercing Insurance - Low-Cost Cover
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Large Size Ear Covers for Shower 60 pcs Ear Protection Disposable Ear Protectors Waterproof for Swimming Bathing Surfing and Other Water Sports Suitable for Adults and Children.
Plastic Earrings for Kids, Safe For Earring Allergies - Blomdahl USA