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Carefully observe the professionals and see what techniques they use. You can also watch video clips of expert bowlers online. Try to imitate the bowler's stances in your own home. Just remember that you're watching experts, and that your bowling technique will be much simpler than theirs. If you want to really improve your game, seek out help from other, more advanced bowlers and from coaches. It will always help to have a critical eye watching you and you will gain new insight. This is a great way to keep up a regular practice and to make new friends.
Watch bowling on TV. Ask for advice. Join a bowling league.