Throughout the year, coaches will ask athletes to train at specific intensity levels, ranging from Level 1 to Level 5. These levels represent varying degrees of effort and are used to guide both heart-rate zones and perceived exertion.
Level 1 (L1): 60–70% of maximum heart rate – aerobic base building
Below is a deeper look at how each training level fits into our program.
Level 1 & 2 Training
Level 1 is the foundation of endurance training and accounts for roughly 80% of an athlete’s total training volume. It builds aerobic capacity and develops efficiency over long durations. Technically, Level 1 corresponds to 60–70% of maximum heart rate, but it’s easier to think of it as “conversation pace.” You should be able to talk comfortably, though not effortlessly. Level 1 is not about skiing slowly or taking it easy—it’s purposeful, steady training meant to strengthen your fitness base. A few key reminders:
Don’t slow to a walk on every hill to keep your heart rate low.
Don’t treat Level 1 as a recovery stroll—it still builds your foundation.
And remember, it’s not a competition; consistency is more important than pace.
Level 2 sits just above Level 1 and is best described as “comfortably uncomfortable.” Many athletes unintentionally spend more time in this zone than they realize—it’s easy to drift into L2 during what should be an L1 workout. Level 2 training uses both fats and carbohydrates for energy, teaching the body to efficiently access these fuel sources during sustained efforts. Because winter training sessions are often shorter, the team incorporates a moderate amount of Level 2 training to strengthen base fitness and prepare for higher intensities later in the season.
Level 3 Training
Level 3—often referred to as lactate threshold training—is one of the most challenging yet beneficial training zones. Physiologically, this is the point where lactic acid begins to accumulate in the muscles faster than it can be cleared. While the exact threshold varies by athlete, L3 typically corresponds to about 85% of maximum heart rate or the maximum effort you could sustain for 40–60 minutes. Because this can be difficult to measure precisely, we focus on perceived effort rather than heart rate alone. The goal of L3 training is to increase the body’s ability to sustain high-intensity effort without excessive fatigue. Improving lactate threshold directly enhances endurance performance, especially in longer races where maintaining a strong, steady pace is critical.
Level 4 Training
Level 4 efforts simulate the intensity of a hard race segment—something you could sustain for 4 to 6 minutes. These workouts are designed to develop race-specific endurance and prepare athletes for the sustained efforts required in competition. Unlike all-out sprints, L4 intervals balance intensity and duration, helping athletes build both power and control under fatigue.
Level 5 Training
Level 5 represents the highest level of effort—comparable to the intensity of a 400–800 meter running race. These short, powerful intervals typically last 1–2 minutes, followed by recovery periods about half as long. The purpose of Level 5 training is to develop top-end speed, explosive power, and technical efficiency. These sessions give athletes the opportunity to refine technique under pressure—focusing on clean movements, efficient pole plants, and strong body positioning. By repeatedly training at this intensity, athletes not only improve their sprinting ability but also enhance their overall skiing and running economy.