OBP was a big leap forward ten or twenty years ago because it gave credit to hitters who reached base via walk or HBP when batting average ignored those things. Any time you don’t make an out, you’re contributing positively to the run scoring process and OBP captures that better than batting average because it incorporates a big slice of offensive activity that batting average doesn’t consider. Getting on base via walk doesn’t help your team quite as much as getting a hit, but it’s certainly valuable enough to warrant inclusion in even the most simplistic metrics.

To stay connected to the body's rotational energy, it is very important that the first movement of the hands is not directed toward the pitcher - or inline with the incoming pitch. The batter should keep his hands back and allow the rotation of the body against the lead arm to accelerate the hands. The first movement of the hands will then be propelled more perpendicular to the flight of the incoming ball. This will induce the greatest amount of angular displacement to the bat and propel the hands into the most productive path.

The second number in a slash line represents on base percentage. This is calculated by dividing the total times a player gets on base (hits, walks, and hit-by-pitch) by a player’s total number of eligible at bats, essentially all trips to the plate minus events outside of the batters control, like reaching on error and hitting into a fielder’s choice). These “eligible at bats” are calculated by adding regular at bats with the total number of times walked, hit-by-pitch, and hit into a sacrifice fly. That gives you the following formula to calculate on-base percentage, or OBP for short.
It's easy for me here if I'm judging a player or team in any given season, because OBP is essentially measuring the amount of times a player doesn't make an out. If no one ever makes an out, I'm pretty sure the team would find a way to do just fine on the scoreboard, right? As for judging players in a historical context, I'll go with OPS+ because it lumps in on-base ability with power and adjusts for all eras, from the steroid era to dead-ball era and everything in between.
Don't swing down on the ball. The backspin you gain from doing so does not outweigh the exit velocity loss that occurs as a result. The best way to get distance is to swing up through the ball. If you slightly undercut the ball that way, you get backspin while achieving a better launch angle and maintaining as much exit velocity as possible. Advanced analytics show that the most effective way to hit home runs is to swing with an attack angle that's slightly less than the ideal launch angle. The following article explains this in more depth.

It waters down bad play of many and you are more willing to use players despite their weakness as a player are one-sided arguments made to favor BA.  Doesn’t batting average reward hits and dismiss players that walk.  And since when is drawing walks considered bad play, it’s a basic fundamental taught throughout the minors and is a sign of a patient hitter.  The weak hitters are the ones that can’t draw walks, and those players can be seen hacking away with a sub-par batting average when then get close to or in their 30’s.
Powerful Legs that are trained through various movement patterns and skill sets. For example, you create a ton of power by super setting (performing these two exercises one after the other with little rest, then repeating) an exercise like a squat and a box hop. This combination of a strength development exercise and a plyometric exercise create explosive power.
Below is an overhead view of a good rotational swing. We have plotted the path of the hands and bat-head. Although the video discusses plate coverage, note that: (1) the bat-head accelerates rearward (back toward the catcher) about 140 degrees before it swings around toward the pitcher (2) the first movement of the hands are more away than toward the pitcher.
Hudson came back from Tommy John surgery in '14 as a relief pitcher so all his batting stats (minus one K in '15) come from his first six seasons. Nevertheless, they're good numbers. In 2011 he won the Silver Slugger Award for pitchers thanks to his .277 batting average with three doubles, one home run and 14 RBI in 65 at-bats, plus three walks. He's now a reliever for the Pirates so probably won't get many at-bats this season.
Runs Batted In: "The guys that knock em in," as Leyland calls them, do make the big bucks in the baseball market. But RBI are, to a great extent, a function of opportunities. You can’t drive in runs, other than solo home runs, unless there are runners on base to drive in. A typical lineup should be arranged so that the big RBI guys follow guys who frequently get "on base, on base, on base." Leyland happened to be talking about Jhonny Peralta, his 80 RBI, and his value to the team when he launched into his philosophical discussion of on-base percentage. What he didn’t mention was that Peralta led the league in at bats with runners in scoring position the previous two seasons. It should be understood that players who get hits tend to also get hits with runners on base, or in scoring position, at about the same rate, averaged over time.
Doug Bernier, founder of Pro Baseball Insider.com, debuted in the Major Leagues in 2008 with the Colorado Rockies, and has played professional baseball for 5 organizations (CO Rockies, NY Yankees, PIT Pirates, MN Twins, & TX Rangers) over the past 16 years. He has Major League time at every infield position, and has played every position on the field professionally except for catcher. Where is he now? After 16 years of playing professionally, he is now a professional scout with the Colorado Rockies. You should click to watch this great defensive play by Bernier
In my opinion this must happen before acceleration so that the barrel can accelerate the appropriate direction. Depending on the the pitch height, the hitter will mirror that height with the angle of their shoulder rotation followed by the degree of the barrel. The higher the pitch, the flatter the rotation and barrel. The lower the pitch the higher the barrel will stay initially and the shoulders will the rotate more vertically. In a perfect world, the barrel level will match the shoulder level at contact.
On an individual level, I'm partial to OPS+ because it's a clear upgrade over traditional measures and, unlike oWAR (which I think is more accurate in a vacuum), it's not quite as off-putting to the uninitiated. I'll happily lean on oWAR when appropriate, though, as it contains a base-running component. On a team level, I tend to stick to runs scored and OPS with on-the-fly adjustments made for ballpark effects.
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Other factors that affect the batter's swing are the effective length and weight of the bat. The farther up the handle the hitter holds the bat, the less time it takes to swing at the ball, for the simple reason that there is less mass to move through space, and therefore less inertia to overcome with sheer muscle power. But consequently, less mass hits the ball. Power is the trade-off for speed and precision, hence the maxim that the more powerful the swing, the less likely the hit.
Now that we’ve covered slash line statistics and plate discipline numbers, all that’s left to go over is batted ball data. The most common batted ball stat that is used is batting average on balls in play, or BABIP for short. While a typical batting average tells you how often a player gets a hit in general, this batting average determines how often a player ends up getting a hit when they hit the ball within the field of play. It is calculated by subtracting home runs from totals hits and dividing that by at bats minus strikeouts minus home runs plus sacrifice flies, which translates to the following formula:
Brian Dozier is another low average players the batting average purists love to hate.  He hit .242, but the rest of his numbers were superior to most players at second.  We complained about his average but nobody took into account that he walked 89 times and scored 112 runs.  If you’re going to count all those extra runs he scored because of the walks you should count the walks as well, and that’s something batting average doesn’t do.  While looking for a comparable player to Dozier, one interesting names came up.  Look at these two batting lines.
Every hitter is entitled to their own style or preference when it comes to stance, set-up, and load. However, when the stride foots lands, all hitters are very much alike in their movements to and through contact. My emphasis will focus on the “non-negotiable” of consistent, hard contact—bat path. Learning to control the bat barrel is an enormous step forward in becoming the best hitter they can be.  
Adjusted OPS-plus (OPS+): You might be familiar with OPS, which is simply on-base percentage added to slugging percentage (forget, for the moment, that they have different denominators). OPS+ is simply OPS adjusted for park and league conditions. It's scaled to 100, which means that 100 indicates a league-average OPS adjusted for park and league. An OPS+ of 110, for instance, is an OPS that's 10 percent better than the league average. On the other end, an OPS+ of 85 is one that's 15 percent worse than the league average. It's useful in that you can make a thumbnail comparison between, say, a hitter in Coors Field in 2000 to one in Dodger Stadium in 1968. It helps correct for the two things that most often corrupt unadjusted stats -- home parks and eras -- and it leans on the the two most important things a hitter can do -- get on base and hit for power. - Dayn Perry
The way you hold the handle of a baseball bat determines the speed and power of your hit. If you choke up on the handle and hold the bat closer to the barrel, you are gaining bat swing speed but losing on the hitting power. If you hold closer to the bottom of the bat, you gain hitting power and momentum but lose on the speed. You should extensively practice with both methods of holding the handle and find the golden mean where you are able to swing quickly and still hit the baseball as far as possible.
"On base, on base, everybody talks about on base percentage. Jim Leyland, I like the guys that knock em in. I know, there’s a lot to be said for that. They talk about 'Moneyball' and working the pitcher and on-base percentage. Yes, there’s a lot to be said for that. But my theory is, during the course of a major league game, normally for both teams, there’s enough guys on base. The guys to me, that make the money are the guys that can score them from first and knock em in. I like the slugging percentage, over the on base percentage, myself. That’s just an opinion."
Probably very few of you except a few Cincinnati residents saw this one coming. Yes, Michael Lorenzen is the current hitting pitcher batting king, according to OPS. The lion's share of the 25-year-old's at-bats (36) came in his rookie season in 2015 when he tallied 9 hits including a triple. Now that he's moved to the bullpen, the opporunties will be fewer. Last year he homered once in five at-bats and this year he's had just three at-bats so far, but he added another home run as a pinch hitter!! So Lorenzen has joined the holy club of pinch-hitting relief pitchers. Tip of the cap!
If the batter doesn't hit the ball just right, he's in trouble. An amazing series of reactions propels a shortstop or third baseman into the path of a hard-hit ball. In two steps or less, he may have already caught the ball and fired it to first base for an out, with a swiftness and assurance acquired only through years of practice. Inherited skill alone just won't do the job.
The best way I can explain “Hitting for Average” is that this tool is not just solely focused on a person’s batting average. This tool is more about having the ability to have a consistent swing, the ability to keep the bat on-plane for a long period of time, and the ability to square up baseballs on a regular basis. I wrote another article about having the ability to “Repeat Your Best Swing.”