Example (excerpt from a story I'm writing):
To make things worse, my schoolmates started calling me “Hanging Pup” from then on (yes, news spread like a diseases at my university. The dumber they were, the faster they propagated). At least they could have chosen a more feminine one. Like “Hara-kitty” or “Floor-jumping Bunny.” Anyway, I didn’t care. I’d never cared much about how people call me or what they think about me. I was usually too busy with my own thoughts to care about other’s.
The problem arose when the story reached my mother. She went to one of these aerobic dancing classes housewives organize in parks. (Not that she was out of shape. On the contrary, she had an dazzling figure: firm breasts, a diminute waist, and hips that, though wide, had no traces of ever having carried a child. She just did it for fun.) The group was mainly composed by my schoolmate’s mothers, so Mom probably heard it from there. She called me that same night.
“This suicide thing again?”
“Not suicide, Mom. Animal suicide.”
What I tried to do (bolded part) was to take advantage of the exercise part to describe the mother's physical appearance. I wonder, though, if that chunk will pull the reader out of the narrative, or make the piece harder to read? (I'm worried of this because it's relatively long).