Some people leave the ground like they are on a trampoline. Others feel bolted to the floor no matter how hard they try. If you have ever wondered why you cannot jump like your bounciest teammate, the honest answer is part genetics and part training, and the split matters more than you think.

How much of your vertical jump is genetic?

Your vertical jump is decided by a handful of qualities. A few of them are handed to you at birth and cannot be changed. Most of them can be trained, and trained a lot. The mistake almost everyone makes is assuming they are in the first group when they are really limited by the second.

What you can't change about your jump ability

These are the genetic cards you are dealt. They set your ceiling, but very few people are anywhere near it:

  • Limb lengths and leverage. The proportions of your legs change how force turns into height.
  • Tendon stiffness. Springy Achilles and patellar tendons store and return more energy, which is a big part of looking naturally bouncy.
  • Muscle fibre type. A higher share of fast-twitch fibres means more explosive potential. You can train the fibres you have, but not swap the ratio wholesale.
  • Height and frame. These do not change your vertical, but they change how far you have to jump to reach a rim or a ball.

What you can change to jump higher

Here is the good news. The qualities that decide the majority of your actual jump are all trainable:

  • Strength. You cannot express power you do not have. Relative strength is the single quality most tightly linked to a big vertical.
  • Power. Strength is useless for jumping if you produce it slowly. Learning to apply force fast is trainable.
  • Reactivity. Plyometrics build your tendons' ability to store and return energy like a spring, closing the gap on the naturally bouncy.
  • Mobility. Tight hips and stiff ankles cap your jump before you leave the floor.
  • Technique. A better approach, plant and arm swing is free height, no extra strength required.

Knowing the list is one thing. Knowing which of these five is holding your jump back is what actually changes your training, and a two-minute jump test reveals it — our guide to testing your vertical jump shows how, and the Metric Jump app runs the whole test from your phone.

Why some people look like they were born to jump

The trampoline types usually do have a genetic head start, favourable tendons and a fast-twitch muscle fibre profile. But look closer and most of them are also simply stronger, more reactive and better coordinated, often from years of jumping in sport without ever calling it training. What looks like pure talent is frequently just a big base of the trainable qualities above. That is the part you can copy.

The handbrake most people never release

The most common reason a young athlete cannot jump is not bad genetics, it is that they are tight and weak, often from a recent growth spurt. They are like a race car driving with the handbrake on. Free up the hips and ankles, build a base of strength, and the same body suddenly jumps far higher, because it can finally use the engine it already has.

Releasing that handbrake starts with stretching. It is boring, nobody wants to hear it, and it is the closest thing to an instant win in jump training — our five-minute stretching routine has added centimetres to athletes' verticals within weeks.

So can you actually jump higher? Almost certainly, yes

Unless you are already a highly trained jumper, your genetics are not the thing holding you back. The four factors that decide your jump, and how to train each one, are laid out in our guide to how to jump higher. Work them in the right order, measure your vertical so you can see it move, and the ground will not feel so far away.

And if you want that order handed to you, this is what we do. We have spent fifteen years helping athletes jump higher, and our seven-week Boring Jump Program packages it all up: every session planned, nothing you cannot do at home, and 6–10 cm (2–4 inches) of vertical is the typical result. Your genetics set a ceiling you are nowhere near — we can help you close the gap.