Second jump and rebounding: the quality that matters more than max vertical

On the glass, the highest jumper rarely wins. The player who goes back up first does. They're two different qualities, they're trained differently, and almost nobody trains the second one.

Your max vertical jump — the one you measure in a test, calmly, focused — tells you how high you can get when you have all the time you need to load. Under the basket you never have that time. You're already in the air, you land badly, you're shoulder to shoulder with someone, and you have to go again in a fraction of a second. There, something else counts.

Max jump and reactive jump: the difference

In the max jump you have time to bend as much as you want, to load your arms, to use all the strength you have. It's a movement that rewards pure strength.

In the reactive jump your foot touches the ground and goes straight back up. There's no time to bend: what pushes you up is largely the elastic energy stored in the landing and given back by your tendons. If you stay on the ground too long that energy dissipates as heat and you have to start again from zero, with muscular strength alone, which is slower.

That's why you see huge, strong players who always get to the rebound second, and less explosive players on a single jump who look like they're on springs under the basket. It isn't magic: it's contact time.

How to work out where you stand

A simple way to get an idea, with no special equipment: do one max vertical jump, taking all the time you want. Then do a set of five consecutive jumps trying to stay on the ground as little as possible, without stopping between them.

Watch the video and ask yourself two things. In the consecutive jumps, do you stay high or do you collapse right after the first one? And how long do you spend on the ground between one jump and the next — is it a sharp tap or is it a squat?

If your single jump is fine but you lose a lot on consecutive jumps, your limit on the glass isn't strength: it's reactivity. If instead your single jump is already low, the problem is further upstream and you need to work on strength first.

How you train reactivity

One rule decides everything: short contacts, few reps, long rests. Reactive work is quality work. The moment your feet start staying on the ground longer than they should, the set is over, even if you had more reps written down.

• Rope jumps with minimal contacts. The cheapest and safest way to work on ankle stiffness. Feet bouncing, knees almost still.
• Consecutive two-footed jumps. Very short sets, trying to cut ground time rather than to go high.
• Bounds over low hurdles. Genuinely low. If you have to bend a lot to clear them, you're not training reactivity any more.
• Jumps with controlled landings. Dropping off a box and sticking the landing teaches your body to absorb. It's the step that comes before real bounding — don't skip it.

Reactive work goes in fresh, at the start of the session, never tacked on to the end of an already heavy practice. When you're tired your contact times stretch out on their own and you're just piling work on your joints with nothing to show for it.

The piece almost everyone neglects: the ankles

In the reactive jump the ankle is the first joint to work, and it has to be stiff at the right moment. If the ankle gives on landing, the whole rest of the chain arrives late. Players with repeated sprains often find their bottleneck here, and no amount of thigh strength work fixes it.

And what about positioning on the boards?

It has to be said, otherwise the message comes out wrong: on a rebound the first thing that matters is where you are, not how high you jump. Whoever reads the trajectory and takes position half a second earlier starts with an advantage that no amount of vertical makes up for.

But when position is even — and in a game that happens constantly — the difference is made by whoever goes again first. That, you can train.

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