Being able to lift heavy stuff isn't really motivation for such dedication to exercise when we have things like bulldozers and cranes and fork lifts. There really is no reason to build muscle except to get bitches and maybe beat up people, although fighting these days is the worst thing you can do even a little scuffle between friends can turn into major charges or lawsuits.
You can't use fork lifts, cranes, and stuff like that all the time.
You should be able to lift heavier objects without trouble in your everyday life.