Arthrokinesis is the ability to mentally manipulate the fine movements and functions of the joints and (sometimes) tendons, either in one's own body, or in the body of another. This ability could be used to increase or decrease flexibility in the bodies of others. This ability could even reduce joint strength in extremities, and manipulate control the contractions and movements of such, similar to Bodily Possession. Used offensively, it could induce arthritis (or crepitus), spasms, backaches and neckaches or other joint-and-tendon based difficulties (even tendonitis or bursitis). This ability is counted as a portion of the ability Biokinesis.