Here I used Hero Forge to design a slim rabbit and a large, muscular female elephant. The rabbit is already impressed with her biceps.

Story
Joran was a slight rabbit and was the middle one of his countless brothers and sisters, as large families are not unusual among rabbits. He particularly enjoyed running near the beach and moping around. He was simply dissatisfied with his body, his older brothers always picked on him and his younger siblings didn't take him seriously. But soon he would have an encounter that would change everything. As he sat on a bench overlooking the beach, a female elephant in pink athletic clothing appeared. When he saw her he was astonished. He had seen elephants before, but they were usually very chubby. But this female elephant had colossal muscles. Filled with both curiosity and awe, he walked toward her. The female noticed him and smiled at him. "Well, my little one, you're fascinated by me, aren't you?" she said kindly. Joran couldn't say anything, so he simply nodded. The female elephant showed him the thickness of her biceps and he opened his mouth in amazement. "Impressive, isn't it?" She uttered, pleased with his reaction. Then he looked at Joran, who still had his mouth open. "Close your mouth, otherwise flies will fly in." she said cheerfully. Embarrassed, Joran closed his mouth and introduced himself to her. "Joran?" said the female elephant, "that comes from the Nordic language and means agricultural worker, farmer." Joran nodded and looked at her, fascinated by her size and mass. "My name is Kymopoleia! Named after the goddess of violent sea storms from Greek mythology and daughter of the sea god Poseidon and the Nereid Amphitrite. My parents say I was born during a violent sea storm. But my friends call me Kim." Joran even thought that the name of a storm goddess could only be appropriate for an elephant like her. Joran had a desire to be with her and even to be trained by her. Joran bowed his knee to Kim, which was probably very exaggerated (luckily the two of them were alone). "Great Kymopoleia, I only have one wish. Train me, help me gain size and strength." At first the elephant seemed surprised, but somehow, she found the rabbit adorable. “You want to be trained by me?” Kim asked. Joran looked at her determinedly. "Are you serious?" she asked him. "Of course, I'm completely serious!" Joran uttered firmly. Kim leaned over and said to him, No problem, buddy. I promise you Joran, you will become a small yet strong mountain."