a 20-year-old trainer is practicing pilates on an elevator chair, lying on her stomach supporting herself with her arms

abdominal arms athletic back balance blonde body breath breathing chair circulation control correction device elevator exercise fit fitness from gymnastics health healthy horizontal human improve instructor joint legs lifestyle lying machine movement muscle muscles old on out pilates posture show side silhouette smiling spine stabilization stimulates stomach straight strengthening stretched supported tense tension trainer twenty view vitality woman working workout years young