What Tennis Actually Demands Physiologically: An Evidence-Based Primer

If you train a tennis player like a runner, you’ll get a fit runner who loses in the third set. If you train one like a sprinter, you’ll get a player who looks fast for forty minutes and dies in a tiebreak. Tennis is neither, and the reason most amateur and even regional-level training programs don’t produce match-tough players is simple: the demands of the sport are misread. Before any drill, periodization plan, or conditioning block is worth writing, you need to know what your athlete is actually being asked to do for two to four hours on court.

What the data says about a tennis match

The most consistent finding across the match-analysis literature is how little time a tennis player spends actually hitting the ball. Across hard, clay, and grass surfaces, the ball is in play for somewhere between 17% and 30% of total match time, with clay at the high end and grass at the low end (Fernandez-Fernandez et al., 2009; Kovacs, 2007). On a hard court, a typical professional point lasts 5–7 seconds. On clay, 7–10 seconds. The rest of those two to four hours is spent walking, recovering, toweling off, changing ends, and waiting.

The work-to-rest ratio is what makes tennis tennis. Points are short and intense. The interval between points is regulated — 25 seconds on tour, somewhat looser at club level — and the changeover gives you 90 seconds every two games. So you’re working in roughly 1:3 to 1:5 work-to-rest ratios at point level, with longer aerobic-recovery windows layered on top. That structure is unlike running, unlike cycling, and only loosely similar to combat sports.

Heart rates tell the same story from a different angle. Match HR averages sit around 140–160 bpm for adult competitive players, with peaks at the end of long rallies hitting 180+ bpm (Fernandez-Fernandez et al., 2010). Blood lactate stays modest in most matches — typically 2–4 mmol/L, rising past 5 mmol/L only during the longest rallies on the slowest surfaces. This is not a sport that lives in the glycolytic furnace. It lives in repeated efforts off the ATP-PCr system with aerobic recovery between them.

Why the energy system mix matters

The dominant energy system during a single point is ATP-PCr — the phosphocreatine pool that fuels maximal, short-duration efforts. Five seconds of all-out tennis is well inside the ATP-PCr window. But here’s what amateur coaches miss: the system that restores ATP-PCr between points is aerobic. The reason a player can hit a 130 km/h forehand on point 100 of a match isn’t because their phosphagen system got bigger over the season. It’s because their aerobic capacity restored it faster.

This is the resolution to the apparent paradox of tennis. The sport is “alactic-aerobic.” The work is alactic. The recovery is aerobic. Both qualities have to be developed, but they are developed through different methods, and ignoring either one produces a player who is unfit for tennis specifically — not unfit in general.

The glycolytic contribution rises only in two situations: long rallies (15+ shots, more common on clay) and the late stages of long matches where the recovery system is overwhelmed. The training implication is that you don’t need to live in lactate training to play tennis well. You need just enough glycolytic exposure to tolerate the rare long rally without falling apart in the next point.

What this rules out (and rules in)

A two-hour Sunday long run does almost nothing for your tennis. It improves a cardiovascular base that supports recovery, which is a fine thing, but the dose-time ratio is terrible — you could get most of the recovery benefit from twenty minutes of properly structured intervals.

Sprint-only conditioning is the opposite mistake. Pure short sprints with full recovery train alactic capacity, which a tennis player has in abundance already. What they don’t train is repeated sprint ability — the capacity to repeat near-maximal efforts with limited rest. That’s the quality you need.

What this rules in is repeated-sprint training, on-court conditioning that mirrors point structure, and a moderate aerobic base. A simple weekly template: two on-court conditioning sessions built around 8–15 second efforts at 1:3 work-to-rest, one continuous aerobic session of 30–45 minutes at conversational pace, and one threshold or VO2max session if the player is competitive enough to need it. That’s it. Layer strength and skill on top.

Heart rate and the long-match problem

Even within the alactic-aerobic frame, something else happens in long matches that most coaches underestimate: cardiac drift. Over the course of a three- to four-hour match, especially in heat, heart rate at the same workload rises while stroke volume falls. The same forehand that cost the player 160 bpm in the first set costs 175 bpm in the third. This is not a failure of fitness. It’s a thermoregulatory and hydration phenomenon.

The implication is that match-day hydration, heat acclimation, and pacing are not soft, optional concerns — they are the difference between a player who plays at level X for three hours and one who plays at level X for one hour, then at level X-minus-15% for two more. Most third-set collapses I see at club level are not mental and not technical. They are a player who started the match dehydrated and never recovered.

Why “tennis-specific conditioning” needs to actually look like tennis

If you took the cleanest version of the literature and built a conditioning session for a tennis player, it wouldn’t look like running. It would look like this: 8–15 second bouts of footwork or hitting at 90–95% effort, 20–40 seconds of active recovery, repeated 8–12 times, with a 2-minute break, then a second set, possibly a third. Total session work-time around 15–20 minutes. Total session duration 45–60 minutes including warm-up and cool-down.

That structure produces both the alactic capacity to dominate points and the aerobic recovery to keep doing it. It does not produce a fit cross-country runner. That’s not what you want.

The most common mistake I see at academies — and I’ve made it myself — is filling conditioning sessions with continuous running because it feels like “work.” The player ends sweaty and tired, the coach ends satisfied, and the actual sport-specific quality has barely moved. Sweat is not transfer.

One thing to do on court tomorrow

Time three of your players’ points and rest periods in their next practice match. Compare the ratio to what you’ve been programming in conditioning. If your intervals don’t roughly match what the sport actually does — 5–10 seconds of work, 20–25 seconds of rest, for sets of 8–12 — change them this week. The single highest-leverage move most tennis coaches can make in their conditioning program is to make the work-rest ratio match the sport.

About the author: Emre Köse is a tennis coach at Beykoz Tenis Kulübü and GDTennis in Istanbul. He holds a BSc in Physical Education Teaching and Coaching from Marmara University.

Related in this series: The point as the unit of analysis · Why aerobic base matters even in an alactic sport · Repeated sprint ability — the most tennis-specific quality

References (selected):

• Fernandez-Fernandez, J., Sanz-Rivas, D., & Mendez-Villanueva, A. (2009). A review of the activity profile and physiological demands of tennis match play. Strength & Conditioning Journal.
• Fernandez-Fernandez, J. et al. (2010). Match activity and physiological responses during a junior tennis tournament. Journal of Strength and Conditioning Research.
• Kovacs, M. S. (2007). Tennis physiology: training the competitive athlete. Sports Medicine.