This study will evaluate a combination of a novel Dual-task regime together with other already known tests in terms of defining when an athlete is ready to return to play after a concussion.

In this prospective study, we will evaluate a combination of a novel facilitating agility Dual-task regime together with sport concussion assessment tool -5 (SCAT5), Vestibular/Ocular-Motor Screening for Concussion, Agility T-test, Joint repositions error test and Pain Catastrophizing Scale (PCS) in terms of defining when an athlete is ready to return to play after a concussion. We will investigate if a novel facilitating agility Dual-task test together with already widely used tests, can identify more athletes that after a concussion still isn't ready to return to play, due to a physiological deficit. We will test as many athletes as possible each season and when an athlete suffer a concussion, we will follow them to see when they reach their baseline level. As previous studies show a over representation of new injuries in athletes returning to play after a concussion, we will also register injuries from all included subjects in terms of injuries each year, to evaluate if athletes following our recommendations have a lower injury rate after returning to play after a concussion. We also hope to be able to get more knowledge about how pain catastrophizing is related to duration of concussions symptoms.

Inclusion Criteria:

• Athletes participating in sports at least 1xweek

Exclusion Criteria:

• injury that limits the participants ability to conduct the tests If the participant don't speak and understand Danish or English Other diseases or conditions that could interfere with one or more of the tests.

Athletes participating in risk sports in terms of concussion.

Maybe we will share data on the concussed athletes.