athletic slender girl by the sea does gymnastic training with head down

forward roll cartwheel rolling wheel somersault legs cartwheeling gymnastics sport fitness gym upside down topsyturvy upsidedown acrobatics stunt performance head equilibrium face split splits doing leg balance balancing equipoise summer summertime sea water ocean girl female girlish teen teens teenager adolescent young beach shore sand seashore train coach exercise training trained practice athletic slender gymnastic strengthen muscles