Arm Swing
Arm swing is an important component of your walking gait in that it counterbalances the swing of the opposite leg. Tension in the upper body can suppress this reflexive motor program, but through awareness and practice, you can awaken this natural movement! Also, notice how the arms are swinging: do they reach forward or do they reach back? How you reach your arms probably corresponds with how you reach your leg. We want to build a posterior driven gait, so just as you want to drive your leg backwards instead of reaching forwards, you want to practice reaching your arms backwards instead of reaching forwards!