The fitness studio should not be issuing both documents. You, yourself say you are an independent contractor which means there is no 'employee' income or withholding. A W-2 should not have been issued to you. The fitness studio should correct the W-2 by filing Form W-2C with the IRS.
As for your tax return, you should file the 1099-NEC as self employment income. The instructions at the link below will get you started. This will complete your tax return entry for both your federal and state returns. Do not enter the W-2, unless the fitness studio does have employee wages for you in addition to the Form 1099-NEC independent work.
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