1. Passive voice: "Physical fitness is paramount" uses the passive voice to emphasize the importance of fitness, rather than who needs it, which is a strategic choice in formal or explanatory writing.
2. Complex sentence structure: The sentence "Achieving a high level of physical fitness not only ensures one's safety during these activities but also enhances the overall enjoyment" uses a complex structure with a correlative conjunction (not only... but also), which effectively connects two related ideas, adding depth to the explanation.
3. Gerunds: Using "engaging" and "achieving" as gerunds (verb forms that function as nouns) helps to abstract these actions, making the discussion more conceptual and less about specific instances, which is suitable for a formal discussion.