A biomechanically optimizing mobile device use system having a mobile computer device with readable storage and a display; an orientation determination system included with the mobile device and adapted to determine a position of the mobile device; and, an operating system that, when the mobile device is powered on and upon each repositioning of the mobile device, is adapted to: determine a current position, determine a reference position relative to one of a vertical position and a face down position, determine a stress angle of the mobile device according to a difference between the current position and the reference position, and, actuate a user notification according to a determination that the stress angle exceeds a predetermined angle for a predetermined length of time.