At age 22 you have a long bowling career ahead of you. A three step approach is a handicap in terms of timing and
ball speed. I would recommend that you use the summer to learn the basic four step approach.
A three step approach properly done requires you to push the
ball out and time your first step so that it is initiated when the
ball is by your ankle in the downswing. Only a few bowlers have mastered the three step approach with any success. Hall of Famer Mike Durbin was one and there are a few power bowlers like Tommy Jones who use it when they are required to stand in front of the
ball return.
The three step approach(if you are a right hander) requires you to step out on your left foot. To execute the four step approach position your feet so the toe of your right foot approximates the instep of your left foot. To start the four step approach your pushaway and your right foot move forward at the same time.
The benefits of the four step approach are that it is the easiest method of acquiring and maintaining good timing. Compared to the three step approach you should get a little more speed on the
ball(naturally)because of increased momentum. With today's lane conditions and juiced-up
balls, good
ball speed is a necessity for consistently high scores.