Based on your description, it sounds like she is performing an exercise similar to a "crunch" or "abdominal crunch." In this exercise, she would be lying on her back with her knees bent, feet flat on the floor, and then curling the upper body towards the knees while keeping the neck and shoulders relaxed, tucking the chin to avoid straining the neck. This is often done in sets or repetitions, which aligns with the mention of doing three repetitions. If you need more details or variations of this exercise, feel free to ask!
And her gym class gratia is asking to perform an exercise that looks like half of a setup she relaxes her neck and shoulders tucks her chin and performs three reputations which exercises she most likely performing
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