Find Your Brisk Zone: Increase by 0.5 kph every 30–60s. Aim for 7.5 – 9.0 kph. Breathing should be faster but you can still speak short sentences (HR 130–150 bpm).
Lock In Your Pace: When talking becomes difficult but possible, that's your "brisk jog". Use this for your 30s work intervals.
Rest Intervals: Step onto side rails OR lower speed to 3.0 – 4.0 kph.