Learn the jump float serve: approach, toss, contact point and landing. With two variants, milestones, a load check for knee and shoulder, and a rules check.
How do I learn the jump float serve? The honest answer: first be able to do the standing float serve securely, then combine it with a short approach, a toss into the space in front of you and a jump. In the jump you hit higher, your serves fly flatter and faster, but the contact point is harder to catch.
Research on the jump float technique is thin. Most studies examine the jump serve with spin or the standing float serve. What we have confirmed: a video analysis with nine top players compared two techniques of the jump float and found advantages and drawbacks that you will find below [1].
Stay at the base until 7 of 10 standing float balls land in the court. The float ball barely rotates and wobbles in the air; that is also the goal in the jump [2]. Milestone: 7 of 10 in the court.
Toss the ball forward into the space in front of you, not high above your head. It should land at a spot you reach with approach and take-off. Milestone: 10 tosses into a circle in front of the line.
Take two to three steps with an arm swing, toss the ball and jump without hitting. The arm swing is a jump helper: in experienced volleyball players it increased the jump height of a counter-movement jump by 38 percent in one measurement, although this value comes from the counter-movement jump and not from the serve [6]. Milestone: after take-off you land balanced behind or on the line.
In the conventional, contact-focused jump float the focus is on clean contact. The contact point is lower than in the jump-focused variant [1]. Milestone: 6 of 10 in the court, most with visible floating.
In the jump-focused jump float the focus is on the jump. In the analysis with nine top players, seven men and two women, the jump-focused variant hit the ball higher, sent it off faster and made it fly flatter. But it is harder to time because the ball moves upward faster before contact [1]. The authors conclude that the flatter path and shorter flight time may challenge reception more; this was not tested on receivers [1]. Land on both legs with slightly bent knees. You may land inside the court; the rules allow it after the hit [4]. Milestone: 5 of 10 in the court without touching the end line at take-off.
The jump float combines two loads: jumping and the overhead hit. For the knee: jumping sports have many patellar tendon problems. In a study of Norwegian elite athletes, 44.6 percent of the men in volleyball currently had patellar tendon complaints, the highest value of all sports examined, so nearly one in two [8]. A meta-analysis found small associations between higher activity volume, higher jump height and patellar tendon problems but no strong evidence for modifiable risk factors [7]. That means: you cannot say for sure which jump exactly is too much. You can only keep an eye on your total volume.
The shoulder is also challenged. In the lab analysis, loads in the jump serve looked similar to those in spiking, though with only five players and for the jump serve, not specifically the jump float. The authors suggest limiting the number of jump serves if you have symptoms [5]. So do not do 60 jump serves in a row in every session.
This guide explains and motivates; it does not replace supervised training.
Hit higher so the opponent can set worse. In a small study with four experienced players receiving jump float serves, a high ball contact by the server was one of the strongest predictors that the receiver passed with the forearm instead of setting. With a sample of four players that is a hint, not a law [3]. In practice: whoever hits higher gets the opponents, in this small sample, more often to use the forearm pass instead of the overhead pass.
First consolidate the standing float, then practise the toss into space, then run up briefly and jump, and only after that hit. Start with the contact-focused variant and later move to the jump-focused one [1].
Yes. The ball moves upward faster before contact, and the take-off has to match the toss [1]. That is why you need the standing float as a foundation.
No. At take-off you must stay behind the end line in the service zone. After the hit you may land inside the court [4].
There is no fixed number. We found no study that sets this for the jump float. Keep an eye on your total volume of jumps and overhead hits and reduce it if you have symptoms [5][7].
The Dig: Defending Hard Attacks from a Low Stance