- I don't want to drive bike along the buisy road, or do running or walking. I prefer to do that in less poluted environment
- The same with car, I want to minimize exposure to outside polution, at least until teleport is discovered or we all live in urban woods.
- Rocks? No, you shouldn't lift rocks for exercise, becuase you will injour yourself. You should lift rocks in general, when you need to lift them, becuase one of the points of exericse is to be fluid in daily life, and if that includes lifting some rocks periodically thats more then OK. But basing your long term exercise strategy on random stuff around is not good idea IMO. As with anything in your life, you need good tools.