Lindsey Vonn is back in the gym two days after revealing she completely tore her ACL. "I'm not giving up 💪🏻 working as hard as I can to make it happen!" the skier, 41, captioned a Thursday, February 5, Instagram Reel that showed her in the gym. "Thank you to my team and everyone for your incredible support. Keep believing 🙏🏻❤️." In the video, Vonn can be seen performing a series of exercises including squats, jumps and lunges. The Olympian also lifted a large barbell while squatting.