Fit mixed race female athlete on a running track at an outdoor sports stadium starting a race from starting blocks in slow motion backlit with lens flare

person running slow motion sprinting sports race track and field athlete starting line determination effort healthy lifestyle young adult motion starting women winning stadium rivalry race training exercising challenge jogging fitness beginnings confidence athletic track starting block countdown foot human leg marathon multiracial one person agility caucasian ethnicity endurance working out waiting track night leg leaning incentive performance lens flare spotlight concentration cardio enjoying health