system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Why is biathlon a challenging sport?


assistant
Biathlon requires two very different skills from athletes. First, they need to be fast on skis, hence their heart rate will go high. But second, they also need to be very precise at shooting, hence be able to lower their heart rate very fast. Having both skills and being able to transition from high intensity to very low intensity activities fast is extremely challenging.