Caucasian man doing sit-ups outdoors

25 29 years arizona authentic authenticity bare chest bench brunette caucasian challenge color image concentrating confident day determination effort exercise fitness focusing front view full length hands behind head healthy living incline lifestyle lifting looking at camera man millennial millennials muscular nature one person outdoors people photography physical fitness portrait posing raising real people routine scottsdale selective focus serious sit up sitting sports clothing sportswear strength training united states vertical wellbeing working out young adult young men 20 25 20 30 20's 20s 25 30 activity adult america american americas apparel az bare bare chest bare chested behind brown hair challenging chest clothes clothing color colour concentration confidence daylight daytime dedication demanding energy exercising exertion fellow focussing fortitude full body full length furnishing furniture garment gentleman guy hand health human human being instructing lifter male muscle natural north america one outdoor outside persistence person picking up portraiture positive power resolution seat seated seating self assured self improvement seriousness shirtless solemn somber southwest teaching topless trainer twenties twenty us usa united states of america us usa western european work out workout