People on exercise mats doing sit-ups

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18-19 year old 18-19 years 20 20-24 years 20s 25-29 years 30-34 years 30s 35-39 years 40-44 years 40s 45-49 years 50-54 years 50s 55-59 Years 636- active wear adult bend carpet casual clothing Caucasian ethnicity clothing color image diversity education elevated view endurance energy exercising exertion female fit five five people food group gym hands behind head happy healthy Healthy Living high angle view indoors inside kneeling Laying learning lie lifestyle lower body lower section low section male male human man mat mature adult mature men model release multi-ethnic Native American ethnicity people person photography physical fitness physical fitness (activity) power property release pupil sit-ups student tilted together waist up water bottle Western Europe white woman young adult