training with heavy cloths? were have i seen that before?

Please. Burk doesn't need to train. He just carries around bricks in case he needs to build something at some point.

I gotta say, I'm glad to see the MAGNIFICENT Aristocrat.
Now my question is...What's in the bag.

Wait, he actually did something smart? Who is he and what has he done with the real Aristocrat?

This goes hand in hand with Burk's established power.

Now, what could he have that is so heavy?

Weight training is a pretty darn old idea. Makes sense that someone as thorough as Burk would use it... or maybe he just carries bricks in his backpack? ... just as likely.

Both, he wears bricks when he trains

Probably filled with condensed osmium...

@Grey
pretty sure you spelled "condensed awesome" wrong. :)

He only wears bricks when he trains because his training consists of pretending to be a house. Plus, he needs to carry around extra bricks because pretending to be a house only works when there's other brick houses nearby.

Gold's pretty heavy, maybe Burk picked some up?

Burk's Bag is basically a Bag of Holding. It holds more stuff inside of it than it has area outside of it. It only doesn't do the weight-reduction thing that pops up in fiction so often.