Beats Me looks like they could be pull up bars that you can sit on, i.e. you sit on the lower bar and pull up as much as you can as you're not putting your entire weight through your hands/arms/shoulders unless you lift your arse off the lower bar completely. 4 of them at different heights to cover different height users.
Balls could be some kind of shuttle run thing. Run from somewhere to the first, touch it, run back to the start, run to the second, touch it, back to the start, ... At different heights to possibly help stretching.
I have no idea - no idea - possibly a frame for helping do leg swings.