This is Dr. Terzа (APK's Fаvоrite Biоmechаnist...and guy whо's literally good at everything). This is a lateral view of him performing a "sissy squat." He is balanced on his toes while lowering his knees to the ground. After touching his knees to the ground, he'll stand back up. Dr. Terza is also quite the yoga practitioner...so he's pretty great at holding static positions. Let's say he's holding this static position and NOT moving. Perform two 6-step analyses: (a) neck and (b) glenohumeral joint.