"Before that, I thought the camera body is what matters, and lenses are not that important, damn I was uneducated!"
I don't much about photography but I think this is a common mistake. Even I thought so and i'm rarely wrong ;)

It's good that lenses are heavy, you don't have to hit the gym!
But please don't get too ripped, you are scary enough even without muscles..

I take photos with my phone, should I buy lens for it?