Zone 2 training: how to build your aerobic base

Zone 2 training is currently the most discussed training principle among cyclists and runners, and for good reason. In April, with the first serious races and sportive tours in sight, now is precisely the time to understand what this calmer effort does to your body and how to get the most out of it.

What is Zone 2 and how do you recognise it?

Zone 2 is the training intensity at which you can comfortably hold a conversation, but still feel that you are working. Your heart rate is roughly between 60 and 70 percent of your maximum heart rate. It feels almost too easy, and that is precisely the pitfall: many athletes train too hard to truly stay in Zone 2.

A reliable heart rate sensor is therefore indispensable. With a Coospo sensor, you can see in real-time whether you are actually staying in the right zone, without guessing by feel. Check out the range of heart rate sensors at Vetturino for an accurate and affordable option.

What physiologically happens in your muscles

During Zone 2 exertion, your body primarily burns fats for fuel. Your muscle cells train their ability to make mitochondria work more efficiently. Mitochondria are the powerhouses of your muscle cells: the more you have, and the better they function, the longer you can perform powerfully without burning out.

Additionally, Zone 2 improves your stroke volume, the amount of blood your heart pumps per beat. A larger stroke volume means your heart needs fewer beats for the same effort. That's why well-trained endurance athletes have a low resting heart rate.

• More and more efficient mitochondria in muscle cells
• Improved fat burning as the primary energy source
• Greater stroke volume and more efficient heart
• Better blood flow and capillary density in the muscles
• Lower lactic acid production at higher intensities later in the season

Why April is the perfect time for Zone 2

In April, the legs are not yet fully sharp, but the motivation to ride or run outdoors is high. This is the ideal time to invest weeks in low intensity and high volume. Those who build a solid aerobic base now will find that their higher intervals are much more effective in June and July. The base is the foundation on which everything else rests.

Try to plan at least two to three sessions per week in Zone 2. Duration can go up to 60 to 90 minutes per session. The temptation to go faster is great, especially when you are fresh. Therefore, continuously monitor your heart rate and maintain discipline.

Cadence as a supplement to heart rate measurement

For cyclists, cadence is a useful addition during Zone 2 rides. A lower cadence forces the muscles to work harder per stroke, a higher cadence shifts the load to the cardiovascular system. During base building, a cadence of 85 to 95 revolutions per minute is optimal for most riders to spare the muscles and train the heart.

Combine a heart rate sensor with a cadence sensor for the complete picture. Check out Coospo's range of speed and cadence sensors for a reliable and easy-to-pair solution.

Zone 2 is not spectacular training, but it is the training that makes all the difference. Patience, consistency, and the right data are your best allies this spring.