Cpl. John Smurr, a senior Marine Corps body bearer, works out his back muscles during an off day, Nov. 24, 2009. https://www.rawpixel.com/image/3577922/free-photo-image-army-barbell-bodybuildingFree Image from public domain licenseBack of a muscular woman. 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boxer putting a strap on her hand https://www.rawpixel.com/image/1222507/fit-woman-pre-workoutView licenseStrong woman at the gym https://www.rawpixel.com/image/428163/woman-lifting-weightsView licenseSeminude black couple https://www.rawpixel.com/image/2025264/shirtless-black-couple-standingView licenseThirsty senior woman in an active sportswear drinking water on a brown wall https://www.rawpixel.com/image/2223244/athletic-senior-woman-drinking-waterView licenseSportive man doing the sit-ups on a balance ball https://www.rawpixel.com/image/2109005/working-out-with-balance-ballsView licenseMuscular woman in black and white wallpaper https://www.rawpixel.com/image/2906815/premium-photo-image-gym-sport-black-and-whiteView licenseSportive people using dumbbells https://www.rawpixel.com/image/2109004/crossfit-weight-lifting-classView licenseFemale boxer putting a strap on her hand https://www.rawpixel.com/image/2107429/wrapping-hand-bandageView licenseHappy active people standing against 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