Watch: How Years of Carrying Heavy Camera Bags Affect Your Body
https://nofilmschool.com/2018/01/how-years-carrying-heavy-camera-bags-affect-body
This info is for people who brings heavy cameras daily... hope helps.
Other (Fit) topic:
https://www.vegascreativesoftware.info/us/forum/fit-exercise-for-us-who-sits-a-lot--104299/