We all love a celebrity fitness secret, so when Hollywood star Jessica Biel credits an interval method for boosting her cardiovascular endurance and longevity, we take notice. Enter the Norwegian 4x4 method: a high-intensity interval protocol fitness lovers have crowned the latest smart training hack.
At a time when wearables are helping us track everything from sleep scores to biological age, it seemed inevitable that VO2 max – a measure of how efficiently your body uses oxygen during exercise that’s increasingly been linked with cardiovascular fitness – would become wellness’ favourite new metric to focus on.
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