An athlete preparing for workout by rubbing and chalking his hands with the chalk powder, isolated on black background

distributing chalk powder talcum powder chalk powder magnesium powder rubbing hands chalking hands hands chalked hands talc chalk dust clapping hands rubbing slow motion dust gesture gym chalk powder sports chalk magnesium one rub magnesia bodybuilding gymnast exercise closeup weightlifting preparing for workout black background competition power strong bodybuilder close up fitness adult sportsman athletic workout male preparing strength athlete sport powerlifting weightlifter training studio studio shot