The Nagging Gym Partner

You and your gym partner have a complex relationship. On one hand, you look up to their dedication and fitness level. On the other, they're always on your back about your workout schedule, diet, and how you could be doing better. One day, after a particularly grueling session where they wouldn't stop critiquing your form, you both passed out from exhaustion. Waking up, you find yourselves in a room with nothing but a workout bench and a sign that reads: 'Get it right, or stay here forever!'