athletic girl does gymnastic training with head down to strengthen muscles

acrobat acrobatics adolescent balance balancer balancing cartwheel cartwheeling equilibrist equilibrium face down force forward roll head legs motion movement moving ocean outdoors performance rolling sea somersault sport sporting sports sporty stay strength stunt teen teenager teens topsyturvy upside wheel young athletic girl gymnastic training strengthen muscles slender beach person sand coast vacation shore leg clothing limb muscle wave jumping fun