Open kinetic chain exercise is characterized by?

• A. Distal segment moves freely
• B. Movement occurs at multiple joints
• C. Usually weight bearing
• D. Distal segment fixed to surface

Answer: (A)

Open kinetic chain exercises are defined by the distal segment moving freely in space, with the end of the limb not fixed to a surface. This allows the hand or foot to move independently while the rest of the limb can stay relatively stable, making it easier to target and isolate specific muscles. Examples include a seated leg extension or a biceps curl, where the hand or foot travels through space rather than being anchored. Because the end is not fixed, these movements typically involve non-weight-bearing, in contrast to closed kinetic chain activities (like squats or push-ups) where the distal segment is fixed to a surface and multiple joints move together. So the best characteristic is that the distal segment moves freely.