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How much zone 5 is risky?

How much zone 5 is risky? For people who are not well-trained athletes, exercising in heart rate zone 5 (90-100% of your maximum heart rate) is not advisable, since this type of exercise could lead to dizziness, fainting, an increase in blood pressure and possibly even a heart attack or severe arrhythmia. Optimal Frequency for

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What is zone 5 used for?

What is zone 5 used for? Zone 5 running can help to improve your speed, power, VO2 Max and anaerobic fitness. Zone 5 running utilises fast-twitch muscle fibres and doing it regularly helps to improve your fast-twitch muscle capacity. Zone 5 is the fundamental ingredient for short high-intensity intervals, while zone 4 is often used

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