手劲儿[shǒu jìnr]
词典muscular strength of the hand：手劲儿。
1. 他们在掰手腕/拗手劲儿。
They're doing arm wrestle.
2. 养成良好习惯，练习单簧管时请站立，而不要坐着或者其他姿势，因为站立吹管有助于集中精力，还可以充分锻炼你右手大拇指托管的手劲儿。
Keep standing-up chronically when you play the clarinet, please do not sit, because stand-up when playing can make you more centralization, and you can exercise your right hand's thumb.