![Sustainable fitness: the gyms where the energy of human exertions is harnessed to power the machines | South China Morning Post Sustainable fitness: the gyms where the energy of human exertions is harnessed to power the machines | South China Morning Post](https://img.i-scmp.com/cdn-cgi/image/fit=contain,width=425,format=auto/sites/default/files/styles/768x768/public/d8/images/methode/2019/10/14/fb54ae30-eb4a-11e9-9e8e-4022fb9638c4_image_hires_192141.jpg?itok=cJ1l-pDA&v=1571052108)
Sustainable fitness: the gyms where the energy of human exertions is harnessed to power the machines | South China Morning Post
![Muscular Fitness Sports Man, Atlete with Dumbbell in Fitness Gym. Energy and Power. Stock Image - Image of hands, biceps: 142973793 Muscular Fitness Sports Man, Atlete with Dumbbell in Fitness Gym. Energy and Power. Stock Image - Image of hands, biceps: 142973793](https://thumbs.dreamstime.com/b/muscular-fitness-sports-man-atlete-dumbbell-fitness-gym-energy-power-athletic-shirtless-young-sports-man-fitness-model-142973793.jpg)
Muscular Fitness Sports Man, Atlete with Dumbbell in Fitness Gym. Energy and Power. Stock Image - Image of hands, biceps: 142973793
![Premium Photo | Team gym and fitness couple doing exercise workout and living a healthy wellness and athletic lifestyle together happy energy and strong friends using teamwork for fun motivation in training Premium Photo | Team gym and fitness couple doing exercise workout and living a healthy wellness and athletic lifestyle together happy energy and strong friends using teamwork for fun motivation in training](https://img.freepik.com/premium-photo/team-gym-fitness-couple-doing-exercise-workout-living-healthy-wellness-athletic-lifestyle-together-happy-energy-strong-friends-using-teamwork-fun-motivation-training_590464-78711.jpg?w=2000)
Premium Photo | Team gym and fitness couple doing exercise workout and living a healthy wellness and athletic lifestyle together happy energy and strong friends using teamwork for fun motivation in training
![Muscular Young Sports Man Workout with Barbell in Gym. Energy Fitness Motivation. Stock Image - Image of strong, weightlifter: 141172503 Muscular Young Sports Man Workout with Barbell in Gym. Energy Fitness Motivation. Stock Image - Image of strong, weightlifter: 141172503](https://thumbs.dreamstime.com/z/muscular-young-sports-man-workout-barbell-gym-energy-fitness-motivation-athletic-shirtless-model-141172503.jpg)