Illustrate a character reminiscent of Mikasa from Attack on Titan struggling and experiencing discomfort while attempting to perform squats at the gym. Portray her wincing in pain as she grapples with maintaining proper form, her muscles visibly fatigued and trembling. Capture the frustration and strain evident on her face, along with a sense of disappointment and discouragement as she struggles to complete each repetition. Emphasize the struggle in her posture and the strain on her features, depicting a palpable sense of physical and emotional exhaustion throughout her squatting session