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Knowledge Library →Fartlek Training"Speed play" — unstructured, continuous training where you spontaneously vary pace between easy and hard, blending continuous and interval work without fixed timing.Running / Jogging (Cardio Modality)A high-impact, high-intensity modality that easily reaches vigorous effort and builds endurance efficiently — but carries the most overuse-injury risk, so mileage must be progressed carefully.VO2 Max and How Cardiovascular Conditioning Improves ItVO2 max (maximal aerobic power) is the ceiling on how much oxygen the body can take in and use; dedicated cardiovascular conditioning (running, cycling) raises it ~15%, versus only ~4–8% from circuit weight training over the same period.TreadmillA motorized (or manual) belt for indoor walking and running with controllable speed and incline — the most familiar cardio machine, weather-proof and precisely adjustable.