Here I used Hero Forge to design the rabbit, who is no longer skinny, and his coach. The rabbit is delighted with the results of his intensive muscle training.

Story
And so, Joran trained intensively under Kim's supervision. During weight training, Kim made sure that Joran maintained the correct posture. Lifting weights, sit-ups, leg curls and running on the treadmill put a lot of strain on Joran. The training continued until late afternoon and Joran fell asleep on a bench. Kim gently picked Joran up and carried him to bed like he was a baby and like a child she put him in bed and tucked him in and whispered in his rabbit ear: Good job, Joran.
Joran was determined to complete everything. Over time this became his favorite activity and Kim watched everything with great enthusiasm.
After several weeks and months of intensive training, the skinny young rabbit was a thing of the past. For a rabbit, Joran had become unusually massive and muscular and was lifting dumbbells that were too heavy for a "normal" rabbit.
Although he wasn't nearly as big as his trainer, he had never felt so good. Joran admired himself in the training hall mirror and also looked at a photograph of himself from the day he started training.
It seemed so unreal that he was so thin. But his acquaintance with this female elephant changed everything.