Most of the reasons why Lin Dan was good at his footwork is because his wrist skills highly powerful. He can turn any disadvantages shots given by opponent and save it so he can gain momentum back. Watch match between him and Lee Chong Wei in World Championships final 2012, AAA game from both players.
It's all about having the required fitness and proper footwork movements. When you have the physicality to move your feet fast and you combine this with the correct foot work movements, you can have the agility to consistently position your body to address the incoming birdie optimally within it's hitting zone. That's why the outcome of all his hitting are excellent and his court coverage movements looks smooth as fluid
Your afraid coz of losing or being judged by the other players.. don't try to impress anybody when playing and never try to worry about the points/winning just play freely so that you can express yourself rather than trying to impress...
Just a little weird to show a video with the purpose of showcasing Lin Dan’s great footwork... by using a game in which he lost 21-10. Surely there are countless better videos to do this with? He’s the GOAT. Anyway, this Lin Dan was nowhere near the pre-2015 Lin Dan in terms of play level.