You're still trying to beat challenges by having the right gear - that's an arms race. List out all your gear. The GM can construct a scenario you aren't prepared for. And, as I said, it is the GM's job to present a challenge - it is supposed to be difficult, no matter what gear you are carrying.
I wasn't being clear enough. I meant the stupid stuff the GM didn't think about because it was, well, the stupid stuff. And all of a sudden the GM is faced with the PCs getting stymied, or blatantly para-dropping the needed gear in through a plot-hole in the ceiling. Most GMs balk at that last step. A GM who balks at that last step is not running a spandex-supers game, even if he thinks he is.
This is a difference between games and real life - in real life you want life-and-death struggles to be as easy as possible. But easy in a game is boring.
Your non-strong hero is faced with a heavy object? Well, if the GM is a real jerk, there's no other way to deal with it than by block and tackle. But, for the majority of the time, there's some way around the obstacle that uses something you can do. That's part of the genre, too, you know. The heroes have the stuff, but they sometimes have to use some ingenuity.
It is all well and good to say "be creative". It is another matter entirely to rely on "creativity", especially when PCs are expected to be spandex wearing, and therefore not able to provide many tools.