You have heard it a hundred times. Power comes from the ground up. The hips fire first. Spin them fast and the disc flies. But a recent research study on the backhand points a different way. Let's walk through what the data actually shows, and what it means for your throw.
Your hips are a base, not an engine
Coach Joonas Merela, a full-time coach who digs into the numbers, studied the backhand throw. One finding stands out. There is no direct link between how fast your pelvis rotates and how fast the disc leaves your hand. If you lined throwers up by hip speed, you could not guess who threw it fastest.
Think about what a real power source looks like on a chart. It spikes, then it slows down. The hips do not do that. On the data they sit as a low, flat line. They move, sure. But they are not the part adding speed.
So what are they for? A base. When you walk up and brace, your legs and hips build a foundation that stays put. In the video's words, the legs work "to stay, not to go." They hold you steady so the real power can happen on top.
One more thing worth knowing. That ground-up chain does show up on the forehand side. On the backhand, the data puts it to rest.
The trunk is the engine
If the hips give you a stable base, the power comes from above it. The data points to your trunk's rotational momentum as the engine of the throw.
Here is the order. You reach back and plant. The moment you brace, the hips have basically done their job. Now the trunk takes over. It rotates and swings your arm into position to fire.
You still have to fire the arm, and timing is everything
The arm matters too, but only when it is timed right with the shoulders. Fire too early and you lose the trunk rotation. Fire too late, after the shoulders have run too far ahead, and you lose the power your arm can add.
Here is where it gets useful. The trunk accelerates from your chest pointed more than 180 degrees away from the target around to side-on. Then it needs to slow down. That hand-off is a crucial moment. If the trunk keeps going, your arm has to fight your own shoulders all the way to the hit.
Most players who ask for help have the opposite problem from what they think. They over-rotate. Their trunk is not lacking. It does too much for too long. So the fix is usually one of two things: slow the shoulders down, or send the hand faster. That is why "arm first, body stable" holds up. The cue that trims the excess is simple: stop your shoulders and send your hand.
There is a rare exception. A few players truly have almost no trunk rotation. If that is you, add rotation and spin hard. But for most people, that is not the issue.
Try this: the thumb wrestle test
Grab a friend. Lock hands like you are about to thumb wrestle. Now try to push them backward two ways.
First, go hips first, ground up. Notice where your arm ends up. It gets caught behind your shoulder, weak, with no leverage. From there you are trying to move someone with an arm that has nothing behind it.
Now start arm first. Pull your body forward with your arm. A beat later your arm sits in a strong position, backed by your big back muscles, ready to push out. That is the feeling you want. The arm works as little as possible for the effort you put in.
What to ignore online
If a video tells you power comes from the ground up, that the hips fire first, or that the arm is just a wet noodle along for the ride, that is not what the backhand data shows. A pro sharing a personal cue is fine and often useful. But "the hips generate the power," stated as fact, is not grounded in the numbers.
Want a plan built around what the data actually says? Our courses were built with this data in mind.