Passage Summary: Kickboxing classes are risky because beginners often hurt their hips and backs by trying to kick as high as the pros do.

Reasoning: Kickboxing aerobics is high-risk; overextending kicks causes specific joint and back injuries; beginners are prone to this overextension when trying to mimic experts.

Analysis: For this Most Strongly Supported question, we must treat the premises as absolute facts and find a safe inference. We know beginners are likely to overextend, and we know overextending leads to hip, knee, or lower-back injuries. Therefore, it is highly probable that beginners in these classes are at a high risk for those specific injuries. Avoid any answer choices that make broad claims about all exercise or suggest that beginners *always* get injured; we only need a likely outcome based on the provided facts.