Tā liàn de shì nèijiā gōngfu, tèbié zhòngshì hūxī hé yìniàn.
He practices internal-style kung fu, paying special attention to breathing and mental focus.
Tips
usage
内家 styles such as 太极拳, 形意拳 and 八卦掌 train breath, posture and intent; 外家 (external) styles, linked with Shaolin, train speed and strength. Tradition traces the internal school to 张三丰 of 武当山.
register
The "imperial palace" sense belongs to old poetry and prose and is not used today.