Training neck muscles in such a way as to improve responsiveness to head acceleration forces, and to help prevent concussion and/or screening subjects who are at high risk of concussion, especially from contact sports or military activities, may be accomplished by a device and/or method of training that incorporates an adjustable centripetal force about a fixed axis on the head. The centripetal force may be adjusted through varying the weight and/or length of a force arm, and neck muscle performance may be measured by a number of revolutions of the force arm completed over a set time period or a time required to complete a pre-determined number of revolutions of the force arm.
