He has trained in martial arts since childhood and is very skilled.
Tips
culture
练拳 covers the whole spectrum from 太极拳 (Tai Chi) practiced by retirees in parks to serious 武术 (wǔshù) training in 长拳, 形意拳, 咏春拳 etc. It's a verb-object compound: 练 'practice' + 拳 (literally 'fist') used as shorthand for any fist-based martial art.