Pinyin: liàn English Definition: to practice; to train; to drill; to perfect (one's skill); exercise; (literary) white silk; to boil and scour raw silk
In Li's opinion, foreigners are an"opportunity" to improve your oral English; whenever you see a foreigner, you should practice speaking English to him/her.
Many times over the years, I have looked back on the days when I confidently practised martial arts and used a gym and wished I felt well enough and confident enough to do those things again.