Head falls or is turned to side; legs extend and/or one or both legs complete one flexion/extension cycle or one leg cycles twice.
head falls or is turned to side; legs extend and/or one or both legs complete one flexion/extension cycle or one leg cycles twice.
Head falls or is turned to side; legs extend and/or one or both legs complete one flexion/extension cycle or one leg cycles twice.
head falls or is turned to side; legs extend and/or one or both legs complete one flexion/extension cycle or one leg cycles twice.