How do the Neck Muscles Influence Head Acceleration During Sport-associated Impact Events in High School Athletes?

Inclusion Criteria: * Provision of signed and dated informed consent form, or assent form with parental consent for minors * Stated willingness to comply with all study procedures and availability for the duration of the study * Participated in a soccer team, club, or other soccer program/organization within the preceding 2 years * Be willing to adhere to the assigned exercise regimen Exclusion Criteria: * Prior history of trauma-induced neck injury of sufficient severity to require treatment by a medical provider within 30 days of injury or to limit sport participation for \> 1 day (note: having received routine chiropractic treatment in the absence of a recent traumatic injury to the neck will not be considered to meet this criterion) * Any prior history of whiplash injury, stinger/burner, or cervical radiculopathy diagnosed by a medical provider * Any prior history of bone, disk, neural, or ligamentous abnormality identified on cervical spine medical imaging performed for any reason that is felt by the PI (or designee) to present a risk to study participation * Any prior history of surgery involving the cervical spine (note: having undergone non-spine surgery to the soft tissue structures in the neck will not necessarily exclude participation, but will be considered on a case-by-case basis by the PI, or his designee, with consultation from the performing surgeon when deemed appropriate) * Self-report of moderate or severe neck pain (rated as 5 or greater on a 10-point p…