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"ACL Injury Prevention: Stay Off the Sidelines." Hospital for Special Surgery, https://www.hss.edu/conditions_acl-injury-prevention-stay-off-sidelines.asp.

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"11 of the Best Patellar Tendonitis Exercises." Resilience Orthopedics, https://www.resilienceorthopedics.com/knee/patellar-tendonitis-exercises/.