I gave it an honest try over the last couple of months. Some things you'll want to consider..
You're going to be using muscle groups that you don't use conventionally. Expect to be sore after the first couple sessions. It's no different than lifting weights after not lifting for a long period of time. Just don't make the mistake of chalking it up to bad form or anything. It's a lot of torque on your upper body. You'll have to deal with that at first, and then it will go away and stop bothering you after those muscle groups get worked out. For me is was my left shoulder and right bicep that suffered the most.
You may want to consider picking up a weak ball if you don't already have one. You're going to find that your rev rate will increase dramatically, but you can't get a matching ball speed. It's not easy to generate ball speed two-handed. You'll want to work on strengthening your legs. Power is generated from the legs and follow through with this style. There's no help from gravity like a one-handed style gets. I was only able to increase ball speed by moving to the line faster, adding a hop to the slide step (Osku and Belmo both demonstrate this technique well) and coming through the ball firm. Even then, I was only about 60-70% of where I needed to be. This was the hardest part to figure out for me and I still haven't gotten it pegged.
Where your hand is at the release is going to dictate success or failure in my opinion. Unlike one-handed, I believe that you don't have a whole lot of versatility in the release. (there's a video of Belmo with a 2-handed project bowler explaining that he gets a different release by changing where his LEFT hand is positioned -- I don't really understand it though). A one-handed bowler can come around the side of the ball and get by just fine, but if you do that with a two-handed release, it's going to be really rough. The ball will roll out extremely early and create a > shaped hook rather than a nice smooth arc or even a hockey stick shape with skid/flip. It's just not going to cut it when it goes 30 feet and just points to the pins and goes straight.
Watch Osku in slow motion.
Note that his fingers are inside of the ball closer to his leg. His arm is angled towards his feet to achieve this. The most common mistake I see, and one I personally dealt with was having the arm hinge straight down from the shoulder, forcing the bowler to come around the outside of it.
There's a ton of videos on YouTube. What is right or wrong, good or bad is a mystery to me since the style isn't really aged. Just search around and watch anything you can find, and then experiment.
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There is nothing so easy to learn as experience and nothing so hard to apply
Edited by se7en on 3/21/2011 at 8:06 AM