I'm Jaime Cevallos. I authored three books on the mechanics of the baseball swing.
Growing up, it was my dream to play professional baseball. The only problem was I couldn't hit. I sought help from books and coaches, but nothing helped. Then one day in college, while tinkering with my swing mechanics, I stumbled upon a change that actually worked, and in a single instant, I went from the worst hitter on my team to the best. No joke, I went from never hitting a home run in my life, to hitting them regularly. This showed me that there is immense opportunity when it comes to making changes to your mechanics, and that you can make small, simple changes that can yield huge results. The downside is that there's also tremendous risk to making mechanical changes. You can head down the wrong path and never find your way back. This is why so many hitters avoid swing gurus like the plague.
The change I made to my mechanics in college was the beginning of what I now call the front arm dominant method. Basically it's this: the greatest pound for pound hitters developed their swings at a very young age, at a time when their back arms weren't strong enough to take over. So, it could be said that a great baseball swing is simply one where the back arm does not over-exert through the swing, which gives the body the room to rotate through the hit. Therefore the hitters who learned to swing when their back arms weren't strong enough to dominate the movement were able to develop a front arm dominant swing. It's front arm dominance that is the essential trait of the greatest pound for pound hitters.
Notice in the above picture the contrast in positioning at contact between Tony Gwynn (a back arm dominant hitter) and Ken Griffey Jr. (a front arm dominant hitter). Notice how disconnected Gwynn is, and how connected Griffey is. Although Gwynn had an amazing career, you'll more often see his positioning at contact in hitters who lack power.
The front arm dominant swing is a more free flowing movement compared to the machine-like swings of today's old school and new school methods. Begin looking out for the front arm dominant swing structure when watching other hitters and you'll see that even the greatest hitters in your league will tend to be more front arm dominant.
The truth is, anyone can be a power hitter. You just have to understand the right feeling through the swing. Let me show you the simple change you can make to your swing right now that will make all the difference.