Anterior view of a full human skeleton with both arms raised 45 degrees.

Posterior view of a full human skeleton with both arms raised 45 degrees.

Posterior view of human skeleton from mid-thigh upwards with left arm raised 45 degrees.

Lateral view of the upper arm illustrating the positioning of the biceps and triceps muscle when the arm is flexed at 45 degrees.

Posterior view of a full human skeleton with left arm raised 90 degrees and right arm at 45 degrees.

45 Degree Spirit Level