Does being physically strong make you more confident?
Sort of......
It's about having belief in yourself, as with their girls in the program, they lacked the confidence in their ability, and shocked themselves at how strong they actually were. So the confidence could come from knowing they are capable of doing stuff, which previously they would stay away from even attempting.
I worked/helped out on farms and stables yards from 6 onwards. I am still physically strong and skilled, even after having years off doing physical jobs. When i have gone back to a physically demanding job I've pushed myself, whilst cursing being unfit, but after a day or 2 of aches and pains I am back up to speed.
I think I have muscle memory so although unused for a while it quickly comes back.
Also from doing physical things from a young age, you learn techniques for doing things, using the object weight and your balance.
I don't think I'm explaining this very well......
Ok an example, when moving heavy boxes/ sofas about a room, some people (men and women) would struggle to push /drag /lift up said item. But you can (and I have) moved them with one hand or if very lazy a push with a well placed knee. Or walked a large item that is way to big/heavy/ to carry.
I use to think everyone knew these techniques, Many do. But lots don't, and yes the majority have been women.