To watch on TV:
Football (Soccer)
Basketball
Badminton
Iceskating
Gymnastic
Swimming
Taekwondo

To watch live:
Tennis
Badminton

To play competitively :

Badminton
Kendo
Swimming

To play leisurely :

Swimming
Badminton
Kendo
chess...if you consider chess as a sport

To play in video games :

F1 Racing
Nunchaku - as Li Long in Soulblade