How much zone 2 training do you need per week?
There is no researched minimum for zone 2 in recreational athletes, but patterns in elite athletes show that low intensity fills the majority of training volume and that removing it comes at a cost to fitness. If your training time is limited, focus on building a broad base of low-intensity work and only add high intensity once that base is in place.
Zone 2 training (exercise at which your blood lactate stays between 2 and 4 mmol/L) takes up a remarkably modest share of the weekly programme for elite athletes. In elite cyclists that share was just 7 to 13% of total training volume, while the large majority of time (65 to 91%) was spent in the even lower zone 1. An Olympic rowing pair averaged 17% zone 2, with the remainder likewise at low intensity. Zone 2 is present in all these cases but is clearly not the dominant zone.
That pattern in elite athletes does not necessarily tell us anything about recreational athletes. In national-level youth swimmers, 7 weeks of more high-intensity training at the expense of low-intensity volume produced no performance gain. Lactate threshold speed actually declined in the group that did less low-intensity training. This suggests that a broad base of low-intensity work contributes to maintaining fitness, even in young athletes.
Concrete weekly figures for the average athlete are difficult to derive from the available studies. What does emerge is that elite endurance sports are characterised by a large total volume with the emphasis on low intensity. Zone 2 is one component of that, not the centrepiece. In world-level running, this translated to 150 to 180 km per week with the majority at a low heart rate; zone 2 was just one of several intensity zones within that.
How much zone 2 you personally need depends first and foremost on your total training time. If you exercise 5 hours per week, even 15% zone 2 amounts to just 45 minutes. The studies provide no minimum threshold value for recreational athletes. What they do show is that athletes who traded low-intensity volume for more high-intensity work did not perform better and sometimes performed worse.
All available studies are descriptive or case-based (single athletes or small groups) without a control group, except for the youth swimmers study (randomised, but small and short). None of the studies tests an optimal zone 2 dose in a controlled experimental design in recreational athletes.
How much Zone 2 training is right without overloading?
There is no hard universal formula for the right amount of Zone 2 training, but lactate as a control tool (target zone 2-4.5 mmol/L) offers a more concrete guide than pace or heart rate alone. Build volume gradually and pay attention to signals such as heart rate variability to monitor fatigue.
What is zone 2 training?
Zone 2 is a training intensity at which your heart and metabolism are challenged without your body tipping into acid build-up, and it makes up the largest share of volume in many training programmes. Tracking your heart rate is the most reliable way to stay in this zone.
How much cardio do I really need per week?
For a healthy adult, 150 minutes of moderate cardio per week is the well-supported minimum, supplemented by two strength-training sessions; if you want to maintain your weight, you are better off aiming for 225-420 minutes per week.
Is 75 minutes of exercise per week already enough?
75 minutes of vigorous exercise per week already delivers close to the maximum benefit for your lifespan. On top of that, make sure you do not sit for too long at a stretch during the day, as that is a separate risk.
How often and how heavy should I strength train?
Start with 2 to 3 training days per week, sets of 8 to 12 repetitions close to your maximum, and increase the weight as soon as you can add extra repetitions. This demonstrably builds both strength and muscle mass at every level.
How much exercise per week lowers your risk of dying?
Even a quarter of an hour of exercise a day makes a measurable difference; the biggest gain comes from going from nothing to something, and those who also add strength training do best.