Tennis court guide

The Tennis 4x4: A 35-Minute Workout for Players Who Die in the Third Set

Tennis points are short bursts: 5–10 seconds of sprinting, lunging, and recovering, then 20 seconds to reset. How fast and how completely you recover between those bursts can be a deciding factor.

Professional matches can run for hours. VO₂ max, your body's engine size, is a key performance lever: it measures how efficiently you use oxygen at peak effort. The bigger the engine, the longer and faster you go.

The best-studied workout for raising VO₂ max is the Norwegian 4x4: four 4-minute efforts at 85–95% of max heart rate, with 3 minutes easy between each. In the original research (Helgerud et al., 2007), 4x4 training outperformed steady jogging and threshold runs for the same total work, and it has been the benchmark protocol for athletes ever since. Here's how to run it without leaving the court.

The workout

Total time: ~35 minutes. You need: a court, a racquet, no balls required.
Warm-up (8 min): Easy footwork around the court, some side shuffles, carioca, a few progressively harder ghost swings.
Then 4 rounds of:
4 minutes ON: ghosting at match-plus intensity. Pick a pattern and shadow it full speed with real swings:

Corners: alternate wide forehand → wide backhand from the center mark
Spider: center → each of the 5 cone positions (both corners, both sidelines, net) and back
Attack-and-recover: baseline → short ball at the service line → backpedal for the lob

Rotate patterns each round. Target 85–95% of max heart rate; by minute 3 you should be breathing too hard to talk. If you can chat, move faster. If you're falling apart before minute 4, back off to "uncomfortably sustainable."

3 minutes OFF: active recovery. Walk the lines, throw in easy shadow swings, sip water. Stay on your feet; the slow movement clears your legs for the next round.

After the four rounds, cool down with easy walking and stretching.

The partner version

One player feeds side-to-side from a basket (or hand-feeds) for 4 minutes while the other runs the pattern hitting real balls. Then swap, so your feeding block doubles as the recovery interval. You each get four work rounds, the ball keeps you honest, and the footwork stays tennis-specific.

How often, and what to expect

Twice a week is enough alongside normal match play. Tuesday and Friday works well; skip the session before any match that matters.

And you don't have to do it on a court every time. The 4x4 is heart-rate based, not drill-based, so any equipment that gets you to 85–95% of max heart rate works: a treadmill (a slight incline helps), a stationary bike, a rower, a stair climber, or a hill near your house. Same structure, 4 minutes hard, 3 minutes easy, four rounds. Rainy week, court's booked, or your legs want a break from cutting and lunging? Take it to the gym and the engine still grows. The on-court ghosting version just adds tennis-specific footwork on top.

In the research, eight weeks of 4x4 raised VO₂ max around 7% in already-active people. On court, that shows up as the thing money can't buy: standing at the baseline at 5–5 in the third, fully recovered at the end of the 25 seconds, while the player across the net is still hands-on-knees.