I was part of the softball team once but I have never played it because when I moved to this school the softball was already off season.
Technically you can put this on your extracurricular list but I wouldn't suggest it. You only have the opportunity to share so many faucets of yourself on the application so it is best to make sure what you do present really represents you and your passions.
If you never actually participated I would leave it out. Although if it was a school sport it should appear in your school records.
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