If you only focus on lifting heavy objects and possibly throwing them then I'd train Deadlift and hip hinge movements. The toss would mostly be generated from the hips and I think an underhand toss would be most efficient... So lifting heavy objects would still be the focus.
If you want to expand the feats of strength to other activities such as jumping, climbing, running, etc then you'd have to address those as well.
I'm pretty much picturing The Caveman Games which was a game on the original Nintendo.
I think to be ready for anything you have to think in a primal manner. If I was alone in nature and had to fight man or beast to survive then what skills would I need?
Answer that and train accordingly.