The same way using a forklift makes you stronger!

Unironically, yes.

In a forklift, I can softly manipulate a lever to lift thousands of pounds, that will not make my arm muscles grow. It's my responsibility to still go to the gym: but even 16 hours a day at the gym: no one is ever going to lift a literal 'ton'. I don't take a forklift to the gym, but I would use it at work...

And this gym metaphor breaks down quickly if you think about it.

A forklift can lift far more than the average human. Just like a train can carry more, faster, than a couple people carrying those goods. Your comment seems to imply that a forklift replaces the need to be strong or physically fit, which is obvious nonsense, so I'm not really sure what you're trying to say, here.