Warm-up

What is a warm-up?

A warm-up is the calm opening phase of impact play: light, rhythmic slaps on one spot, usually with the bare hand, before anything harder or any implement comes into it. The skin gets its blood flowing and the pain threshold rises with it. Without that phase you have to hit harder for the same feeling.

What a warm-up looks like in practice

Like ten minutes that look dull from the outside and don’t from the inside.

Take the most common form, a spanking over the knee. The first slaps are barely slaps: flat hand, little force, roughly one tap a second, always on that same patch of buttock about the size of two palms. After a minute or two the skin turns pink. After five minutes that color is deeper and warmer and the feeling shifts from “tap” to “glow”. Only then does force come into it.

What you see in those minutes is an ordinary skin reaction with a name. The StatPearls monograph on dermatographism describes the three-stage reaction that happens the moment you stroke the skin with something blunt: first the capillaries widen, then a nerve reflex brings a broader red flush around it, and finally fluid leaks into the tissue. That reaction is complete within five minutes on average and, on ordinary skin, fades again within ten.

Hence the pace. You’re building something that fades on its own.

How a warm-up works

Two things happen at once, and only the first is visible.

The visible part is blood flow: more blood in the outer skin, so warmth, color, and skin that gives instead of flinching at every slap.

The invisible part is called habituation. In the scoping review by van der Miesen and colleagues, which set 63 studies side by side, habituation to pain is one of the best-documented learning processes there is: with repeated pain stimulation the reported pain drops, and on brain scans the activity in the pain-processing regions falls while the stimulus stays the same. The same tap does less after ten minutes than in the first minute, without anything about the tap having changed.

In BDSM it has been measured specifically too. Wuyts and Morrens write in their systematic review in The Journal of Sexual Medicine that pain thresholds in submissive participants already sit higher than in others, and that a BDSM interaction can raise those thresholds further. The warm-up is the part where that happens.

There’s the catch. A warm-up shifts the measuring instrument, not the load the tissue can take.

What a warm-up gives you

Room. Someone who warms up arrives at an intensity that the same person, with no warm-up phase, would have asked to stop at.

• For the person taking the slaps the whole evening shifts upward. The scene lasts longer, and the jump from “this is fun” to “this is too much” becomes a slope instead of an edge.
• For the person hitting the warm-up is the only chance to read what someone can take before it matters. Breathing, muscle tension, moving with it or stiffening up: you see that in minute three, not in minute fifteen.
• For a couple it halves the odds of the classic slip, where one person scales up too fast out of impatience and the other spends the rest of the evening processing it.

Habituation is no guarantee. Van der Miesen’s review names large individual differences and a strong effect of expectation outright. There are people in whom repeated stimulation softens nothing. For them a warm-up lengthens the scene but doesn’t move the limit.

How people warm up

Almost always by hand, on one spot, climbing in tempo instead of in force.

You’ll run into three forms. With the bare hand, the default, because the slap lands on the giver too and that keeps you measured on its own. A light flogger with many tails, where the first minutes are more stroking than striking. And the clothed version, where the fabric softens the first quarter of an hour.

What separates the careful version from the sloppy one isn’t the technique but the clock. A sloppy warm-up takes two minutes and is impatience with a tidy name.

What a warm-up is not

“A warm-up is foreplay.” No. Foreplay builds arousal, a warm-up builds blood flow and habituation. They often coincide, but you can be neatly warmed up without a trace of arousal, and in a scene with a punishment frame that’s the whole idea.

“A warm-up is time you lose.” The reverse. What you don’t spend in time at the start you have to make up in force later, and force is the knob with the smallest margin.

“A warm-up gets the endorphins going.” That’s the story everywhere, including in older texts on this site, and it hasn’t been measured. Wuyts and colleagues did include beta-endorphin in their study of 35 Flemish BDSM couples, but it doesn’t turn up in the results: what does is cortisol and endocannabinoids. See endorphin for why that difference matters.

What I see of it myself

I’m Victor, a gigolo, twenty-five years into BDSM and trained as a psychotherapist. The warm-up is the part of my work that draws impatience most often, and rarely from my side.

Before any object comes into it I always do the same thing: ten minutes by hand. Not because it’s protocol, but because in those ten minutes I learn what someone can take. There’s usually a moment where a person stops waiting for the next slap and starts breathing along with it. That’s the signal.

Afterward I hear almost without exception the same thing, usually with surprise: the end of the evening was harder than what they said yes to at the start. No ambush. The warm-up phase that did its job.

What you can do yourself

• Set aside ten minutes and watch the clock, because without a clock it turns into three.
• Stay on the fleshy part of the buttocks during the warm-up and don’t explore other spots yet.
• Build up in tempo, not in force. More taps at the same level carry someone further than a few hard slaps pushed through.
• Ask once, halfway, how it feels, and pay more attention to the breathing than to the answer.
• Don’t go by what feels possible halfway through. The pain threshold rises during a scene; the kidneys and the tailbone don’t rise with it.
• On a second round, warm up again, even after a short break, because the skin reaction fades within ten minutes.

More on warming up

On this site, the order that a warm-up is the first step of is on impact play, and the article on the art of whipping describes how a whip session is built from light to heavy.

Off this site, the scoping review by van der Miesen and colleagues is free to read and the best overview of what habituation to pain does and doesn’t do, and the StatPearls monograph on dermatographism explains in four sentences why skin turns red and warm from being slapped.

Where this fits on this site

If you want to try impact play without having to figure out how long to warm up yourself, the page about the BDSM date shows how an evening like that is built.

Sources

• Habituation to pain: self-report, electroencephalography, and functional magnetic resonance imaging in healthy individuals. A scoping review and future recommendations. Maite M. van der Miesen, Elbert A. Joosten, Amanda L. Kaas, David E. J. Linden, Judith C. Peters & Catherine J. Vossen, PAIN 165(3), 500–522, 2024. Scoping review over 63 studies; supplies that repeated pain stimulation lowers reported pain and visibly reduces activity in pain-processing brain regions, and that expectation and individual differences play a large role in it.
• The Biology of BDSM: A Systematic Review. Elise Wuyts & Manuel Morrens, The Journal of Sexual Medicine 19(1), 144–157, 2022. Supplies the finding that pain thresholds sit higher in submissive participants than in others and that a BDSM interaction can raise those thresholds further.
• Dermatographism. Timothy Nobles, Mikel E. Muse & George J. Schmieder, StatPearls, revised 20 February 2023. Supplies the three-stage reaction of the skin after stroking or pressure (widening of the capillaries, a broader red flush via a nerve reflex, and fluid leakage), the fact that this reaction is complete within five minutes on average, and that an ordinary skin reaction fades again within ten minutes.
• Between Pleasure and Pain: A Pilot Study on the Biological Mechanisms Associated With BDSM Interactions in Dominants and Submissives. Wuyts, De Neef, Coppens, Fransen, Schellens, Van Der Pol & Morrens, The Journal of Sexual Medicine 17(4), 784–792, 2020. Thirty-five Flemish BDSM couples measured during a real scene; supplies that cortisol, beta-endorphin, and endocannabinoids were all measured and that only cortisol and endocannabinoids turn up in the results.

Related terms

• Impact play. The family that a warm-up is the first phase of.
• Bare-bottom spanking. The form where almost everyone learns to warm up.
• Flogger. The one implement regularly picked up during the warm-up phase itself.
• Endorphin. The substance folklore says explains the warm-up, and what is and isn’t true about that.
• Aftercare. The mirror of the warm-up: the wind-down at the end of the scene.
• Corporal punishment. The case where a warm-up is sometimes skipped on purpose, and what that means.
• Boundary. What does not rise along with the pain threshold.
• Pain threshold. The point that a warm-up shifts, and how you measure it.
• Over the knee. The position this warm-up almost always happens in.
• Slapper. The implement picked up most in this phase, because it sounds harder than it lands.
• Spanking. The form where this phase is skipped most often.