I don't mind cardio, but running > me. Why is that? I can play 3 hours of ice hockey, ride a bike all day, hit the heavy bag like it's my job, but running 1 mile puts me on my face. My knees hurt, my shins are throbbing, my feet are swollen, and I feel like shit. Does this happen to anyone else? How do I fix this shit? Is running the benchmark for cardiovascular health? Am I in shitty shape?