Pool...position play using the rails
 

titled specifically so if you're not interested, don't click. Others may find this interesting..explains how a skiiled player often ends up after a shot with successive shots looking so easy. To top players, this becomes almost instinctual...knowledge gained after hitting millions of shots and countless hours at the table. About 10 minutes...

https://www.youtube.com/watch?v=FlQoXanbYFs