As an athlete pushes off the ground, he or she must overcome his/her own body weight. The lighter the athlete, the less force is necessary to do this. Imagine trying to jump as high as you can and then immediately repeating this same test wearing a 20-pound vest. It's obvious that the second jump will be much smaller. Now, imagine how much higher you could jump if you were 20 pounds lighter.
IMPORTANT NOTE: Feb 2, 2019 - I am currently updating the site to have all the articles on the same format and also shooting new HD videos of the exercises in the library. For the duration of the this update I am selling Game Changers at an 80% discount (YES YOUR READ THAT RIGHT - 80% OFF the regular price). Instead of paying $47 you can pick up a copy of just $9. But hurry - this offer will be gone once I finish the updates.

Technique Tip: Determining how far out in front of you to place your front foot may require some trial and error. At the bottom of the motion, your front knee should be somewhere above your heel to mid foot. If your knee is behind your heel, your foot is too far forward; if it’s out over your toes, step out further. One trick to find the right distance is to start in the bottom position and adjust your stance from there. Then stand up and have someone hand you the dumbbells.
In this multicenter, randomized trial, we assigned patients with shock to receive either dopamine or norepinephrine as first-line vasopressor therapy to restore and maintain blood pressure. When blood pressure could not be maintained with a dose of 20 μg per kilogram of body weight per minute for dopamine or a dose of 0.19 μg per kilogram per minute for norepinephrine, open-label norepinephrine, epinephrine, or vasopressin could be added. The primary outcome was the rate of death at 28 days after randomization; secondary end points included the number of days without need for organ support and the occurrence of adverse events.

When tendons elongate to a greater extent during a jumping movement that is preceded by a countermovement, the muscle lengthens less. This produces two effects. Firstly, the greater elongation of the tendon means that more elastic energy is stored during the countermovement, which is then released in the subsequent jumping phase. Secondly, the smaller elongation of the muscle means that countermovement depth can be greater for the same shortening velocity in the subsequent jumping phase, because the muscle never lengthened that much to begin with. Since shortening velocity determines force, this allows the same muscle force to be produced, despite the larger joint range of motion.
A vital part of basketball training is improving your vertical leap. As an athlete, you should be incorporating exercises into your basketball drills and fitness training that focus on increasing muscle strength and leg speed. Simply put, you won’t turn into Vince Carter or Andre Iguodala overnight, but learning how to work the appropriate muscles on a daily basis will go a far way towards improving your overall vertical.
If you took a poll of the areas athletes wanted to improve the most, their vertical jump would be among the tops. Athletes playing basketball and volleyball rely on their verticals in a number of ways, but one major way is it gives them an edge to stand out amongst their peers. Players want to jump higher and coaches are looking for players that can put some space between their feet and the court.
My quest to dunk started poorly. The main problem was that I could only do about half of the very long list of ercises the Jump Manual instructed at the crowded and inadequate YMCA near my place. The basketball court—the only space big enough to do some of the drills—was always occupied with classes. The Strength Shoes, meanwhile, were so absurd that I was too embarrassed to wear them in front of other gym-goers. I used them only a handful of times, in an empty stairwell on the top floor of the gym.
About 100 yards away from this 9' 10" breakaway rim (which came to sound, each time I grabbed and released it, like someone closing the metal baby gate at the top of our stairs) was a brown, oxidized, immobile 9' 1" version, a hand-ruining iron maiden where, in front of the occasional puzzled onlooker, I practiced (and practiced) the timing and the hand and wrist work required to dunk. I knew early on that my regulation dunk, if it ever came to pass, would have to come from a lob of some sort—a bounce to myself, either off the blacktop or underhanded off the backboard—after which I would hypothetically control the ball with one hand just long enough to flush it. Mastering the placement and the delicate timing of such lobs would prove to be a quixotic pursuit in and of itself. But it was necessary, not just because of my hand size (7 ¾ inches) but also because I needed to keep my arms free so I could swing them at takeoff, adding much-needed lift to my leap.
If the patient was already being treated with a vasopressor at baseline, that agent was replaced as soon as possible with the trial-drug solution. If the patient was already receiving dopamine and this agent could not be discontinued after introduction of the trial-drug solution, the dopamine was replaced with an open-label norepinephrine infusion. Open-label dopamine was not allowed at any time. Epinephrine and vasopressin were used only as rescue therapy. Inotropic agents could be used, if needed, to increase cardiac output.

When an individual has a force-velocity gradient angled such that force is too high and velocity is too low, they benefit most from high-velocity strength training exercises with light loads. Conversely, when an individual has a force-velocity gradient angled such that force is too low and velocity is too high, they benefit most from low-velocity strength training exercises with heavy loads. Often, individuals with a long history of heavy strength training display profiles that are not ideal for vertical jumping, because their force is too high, and their velocity is too low, so they need to focus on high-velocity strength training.
Ok I just turned 18 2 months ago and I'm 6,2 and weigh about 155 and I'm very athlectic I've played basketball ever since 3rd grade so I'm very familiar with tecniques and fundamentals I don't play as much as I used to but I can still get rim on my thumb no prob but can't dunk.what can I do bc I wanna jam on my bro. Also being noted that I've dunked about 2 Times but were sloppy plz help
these shocks make a big difference in handling and ride on the2015 4wd F250. This will make the suspension work rather than the whole vehicle simply shuddering up and down over small bumps and holes in the road. Tires stay in contact with road, suspension moves, you and the seat stay still, what a concept! OEM shocks don't even move once compressed, pityful. You will need an 18 mm wrench or socket for lower shock mount bolts and a 21 mm open end, box end or deep socket for the top mount nut and a 20mm or adjustable wrench for the shaft bolt on the top mount. Once the old shocks are off, you need a 19mm open end or socket for the Bilstein top mount nut and you hold the shaft from moving with a hex key, in my experience I didn't really need that but you may want to. Check the top of the shaft you'll see a hex hole up there, seems like it was a 6mm but don't hold me to that. Forget any jacking, removing tires, etc to do this it isn't necessary, and much safer with wheels on the ground while you are under there. If you need some space I drove the wheel I was working on over a 2x12 and that gave me a little height to work with. I wasn't in the mood to fool with jacks, jack stands and all that. No need to. Just crank the steering wheel over away from the side you are working on and you'll have plenty of room. The only issue is after attaching the lower shock mounts using the OEM 18mm bolt/nut, you need to compress the shock about 3" to get it into the upper mounting hole. I used a common tie down racheting strap for this job. I hooked one hook to the chassis right under the lower shock mount bracket on the truck and after adjusting the strap length I put the upper hook around the top shock rubber grommet and washer (lower one already installed now, put upper ones on after shock is in place, of course). At this point you just crank the rachet on the strap until the shock compresses a few inches and shove the shaft under the mounting hole, release the rachet and up pops the shock into place. Put on upper grommet and washer, tighten 19mm nut and presto! IF the shaft turns while you tighten this nut hold the shaft still with the hex key mentioned earlier. Your truck is now a better place to be. Also just tighten upper nut until the grommet fills or slightly goes outside the washer, don't crank it down and flatten the grommet. If you aren't sure look at the OEM arrangement for an idea on how tight to go with that nut. Happy motoring !!
My early efforts were clumsy. Jumping willy-nilly as high as I could, with no regard for technique, I occasionally felt my finger graze the underside of the rim. Most times I did not. What I did feel early on was a firm self-awareness­ that I was a two-foot jumper (like Spud Webb, Dominique Wilkins, Vince Carter and myriad NBA Slam Dunk champions with whom I have nothing else in common athletically) as opposed to a one-foot jumper (see: Julius Erving, Clyde Drexler, Michael Jordan). This meant that my best shot at dunking would be to elevate like an outside hitter in volleyball—that is, by stepping forward with one foot, quickly planting my trailing foot next to it and then propelling myself upward off both.
Results: You need a 0 Inch vertical leap to touch the rim and 6 Inch leap to dunk considering that you have to jump about 6 inches over the rim to dunk. To accomplish that you have to leave the ground at a speed of 1.73 m/s vertically no matter how much you weigh. You need a force of 0 Newtons against the ground based on your weight to reach that speed assuming you bent your knees at an angle of 60 degrees. The force depends on how much you bent your knees. Check side bar.

In the ABA, Charlie Hentz broke two backboards in the same game on November 6, 1970 resulting in the game being called.[43] In the NCAA, Jerome Lane shattered a backboard while playing for Pitt in a 1988 regular-season game against Providence, and Darvin Ham did the same while playing for Texas Tech in a tournament game against North Carolina in 1996.

Stand on the bottom step of a flight of stairs holding the railing on either side. Place the balls of your feet on the stair with your heels hanging off the edge. Slowly raise your heels as high as you can, and hold for two seconds. Slowly lower your heels below your toe level, and hold for two seconds. Repeat calf raises exercise 20 times for three sets with a 1-minute break between each set.


At the onset of the jump, the ball is controlled by either one or both hands and once in the air is typically brought to chest level. The player will then quickly thrust the ball downwards and fully extend their arms, bringing the ball below the waist. Finally the ball is brought above the head and dunked with one or both hands; and the double clutch appears as one fluid motion. As a demonstration of athletic prowess, the ball may be held in the below-the-waist position for milliseconds longer, thus showcasing the player's hang time (jumping ability).
James Naismith, I learned, was a bit different. “I was only three when he passed away [in 1939],” said his grandson, James Naismith, 78, of Corpus Christi, Texas. “He was known as a tenderhearted man, but he also had”—the doctor’s namesake pauses—“the polite term is ‘firmness of mind.’ It’s kind of a family trait. He devoted his life to improving the lives of others through physical activity, through games. That took time.
Use a smaller ball. It's much easier, when you're first starting out, to try dunking with a smaller ball. You'll be able to palm it more easily and control your approach, making the maneuver more satisfying and your practice closer to the real thing. Continue dribbling and shooting exercises with the appropriate-sized ball so you're not getting too used to the "wrong" size, but keep a small ball around for your sick dunks.[1]
The player approaches the basket and leaps as they would for a generic dunk. Instead of simply dunking the ball with one or two hands, the player allows their forearm(s) to pass through the basket, hooking their elbow pit on the rim before hanging for a short period of time. Although the dunk was introduced by Vince Carter in the 2000 NBA Slam Dunk contest, Kobe Bryant was filmed performing the dunk two years earlier at an exhibition in the Philippines.[22] Colloquially, the dunk has a variety of names including 'honey dip', 'cookie jar', and 'elbow hook'.
The vertical jump involves coordinated spine, hip, knee, and ankle extension to produce force in a vertical direction very quickly, while the muscles are shortening through to a very short muscle length. Since the time available for producing force is long compared to other athletic movements, this reduces the importance of rate of force development. Yet, the force-velocity relationship is the primary determinant of the amount of force that can be exerted at a given movement speed. Therefore, maximum force, velocity, and the force-velocity gradient all affect vertical jump height.
You will need to get at least that high to be able to snap the ball into the basket. If you're relatively short, then you have your work cut out for you. Developing a one-handed dunk requires less vertical ability than a two-handed dunk, and, for most players, jumping off of one foot from a running start makes it easier to jump high enough to dunk. There are many things that you can do to work on your vertical leap.
Justifying these selfish, skewed priorities in my head as I stuffed a basketball into my backpack and pedaled away from our home would turn out to be one of the most formidable obstacles in my path. I must have whispered, What the f--- am I doing? as many times as I leaped toward one of the rusty rims scattered around the south Los Angeles beach community where we live. That latter number tallied somewhere around 5,000, according to my journal and 24-plus hours of video. Many of these jumps were attempted while wearing a weighted vest that pulled me downward, the same way that home pulled me sideways.
I tried to work out at least a couple of hours a day doing something or other. So some days were lifting, doing arm and core lifting. Again, you can imagine these sprinters, they’re strong all over — if you think of Tyson Gay or someone. It’s not just their legs that are muscular, it’s their arms, too, because they have to pump furiously to get themselves to go faster.
Each time you land, spring immediately back up. Don’t hesitate. The single beat that typically happens after we hit the ground is a natural reflex, and we may not even realize we’re doing it. But that extra pause has to go if we’re looking for a way to jump higher. Check the mirror or watch videos of yourself as you hit the ground. The momentary pause you may see between one vertical jump and the next may be holding you back. For more detail on how this works, visit the plyometrics section of our website.
Scaling the back squat for beginner-level athletes generally entails sticking to lighter loads (even bodyweight only to start) while learning proper technique. Goblet squats with a kettlebell or dumbbell can be used to practice form, but keep in mind that goblets are an anterior (front-loaded) variation and won’t directly mimic the mechanics of the back squat.
Important Update! – I have been receiving a few emails/comments on players tracking their jump during the course of their program. Please understand that what you are doing when completing a jump program is breaking down the muscle.  You aren’t going to see improvements mid-week because the muscle hasn’t healed properly. That’s why I suggest only checking how much you’ve improved at the end of each rest week. Rest is just as important as the routine. 
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