Drafting saves measurable energy in cross-country skiing. How the elite races the Gundersen pursuit tactically — forming packs, sitting in, sprinting home.
Straight talk: in a Gundersen pursuit the strongest skier rarely wins — the one who uses the pack properly does. The reason is measurable: skiing behind someone in cross-country lowers your oxygen uptake by around 5.5 percent and your energy cost by about 7.3 percent, because aerodynamic drag drops by nearly 10 percent [2].
Translated into heart rate that means 165 instead of 172 beats per minute at the same speed [2] — identical pace, noticeably less effort. Over 10 kilometres that is not a detail, it is the currency of the race.
And the race is a chase from the first second: the jumping points have already been converted into seconds, the best jumper starts first, and whoever crosses the line first wins [1]. From the start signal on it is no longer about distance, it is about positions.
Your gap is known and fixed [1]. From it follows the race plan: who can you realistically catch in lap one, who will catch you, and where does the first workable group form?
Two skiers taking turns are almost always faster than two lone fighters 15 seconds apart. The reason is in the measurements: sitting in clearly lowers oxygen uptake and energy cost [2]. In a pursuit race, cooperation is not fair play, it is physics.
The effect is real but not free: it demands concentration, a close gap and the willingness to take a turn at the front. In one measurement over 2 kilometres of high-intensity skating at around 20 km/h, relative heart rate behind was five percentage points lower than in front [2].
If the group stays together, the last 200 metres decide. That is exactly what gets trained for over years [3] — and exactly where medals fall [4].
In the Compact, time gaps after jumping are capped, which favours strong skiers and produces bigger groups [5]. In the Mass Start, the field starts together and the ski times are only afterwards converted into points for the jumping [5] — there, tactics is a pure mass-start problem.
Riding close in a draft on skating courses carries a crash and collision risk: poles tangle, ski tails get clipped, and on descents the gap closes fast. Keep distance on downhills and blind sections — the energy you save is not worth a crash.
The cross-country half remains the low-risk half of Nordic combined. For the other half the rule is unchanged: this page explains and motivates, it never replaces supervised training on the hill with a club and a qualified coach.
And one point that gets lost in racing fever: a pursuit is raced in any weather. Clothing and gloves matched to the conditions decide results more often than a clever rotation does.
Train drafting as a skill, not as an accident. Do intervals deliberately in pairs: 2 kilometres high intensity, one leads, one sits in, then swap — and measure both heart rates. The difference sits in the range of several percentage points [2].
Once you have seen that number on your own watch, you will never again ride at the front out of pride. This calculation is what decides Gundersen races — not the last three metres on the take-off table.
They calculate their gap before the start — 15 points equal one minute [1] — and plan which group they can ski with. After that it is about forming packs, sharing the lead work and saving the finish sprint, which decides races right up to Olympic gold [3][4].
Measurably a lot: oxygen uptake drops by around 5.5 percent, energy cost by about 7.3 percent and aerodynamic drag by nearly 10 percent [2]. In heart-rate terms, 165 versus 172 beats per minute were measured; over 2 kilometres of intense skating at around 20 km/h, relative heart rate behind was five percentage points lower [2].
Because pursuit races often end in groups. Developing finish-sprint ability is one of the central world-class strategies [3], and for one Olympic champion in Nordic combined both gold medals were settled in the closing sprint [4].
It caps the time gaps after jumping and thereby favours strong skiers [5]. In practice that means denser fields, bigger groups, more drafting situations — and even more weight on the end of the race.
No. The effect requires a close gap and becomes a crash risk on descents and blind sections. Cooperation also only works if you take your turns — a skier who never leads is not tolerated in the group for long.
World-Class Concurrent Training: Managing Interference and Periodising It