The kinetic chain describes how your body works as one connected system. When we assess movement, we consider how each link relates to the next — foot to ankle, hip to low back, shoulder to neck. A restriction in one area can change how you move elsewhere.
Importantly, these are relationships we assess individually. Where you feel it is where we start — not necessarily where we stop looking. This article introduces the idea and how it shapes care at Psalm 30:2.