Use a wearable that tracks heart rate and power, sync it to a simple app that shows your target zone in real time. Set up short bursts—thirty seconds of maximum effort followed by fifteen seconds of full recovery. Program the app to give a beep or vibration when you dip below the target. Keep the intervals short enough that you’re always pushing; no time to linger. Train that way, then review the data each session and tighten the window if you’re slipping. That’s how you force peak moments with no lag.