So, if you "get stuck" at a certain weight, one of two things is generally happening.

You are contracted to come in at a certain weight.

The baby fish are sent to various freshwater tanks until they reach a certain weight.

Q. Do you have to be a certain weight to join the organization?

When you "get stuck" at a certain weight, simply be patient.

There was a certain dry weight at the back of her throat.

There was a certain weight on his heart which he wanted to remove.

At the same time her novel lacks a certain narrative weight.

The Sears catalogue carried a certain weight in our family.

The world needs a certain weight to keep it turning.