Badminton is such a charming sport

I've been hooked on badminton and have been playing for two years now, and the addiction is real.
The physical activity level is also immense. I've tried swimming, running, and various other exercises, but badminton is definitely the most intense. The amount of exercise per unit of time is very high. I thought it was a sport played with your arms, but they say it's actually played with your feet.
That's why An Se-young seems truly amazing. Just moving back and forth with a few steps is exhausting, but An Se-young doesn't even show any change in her facial expression.