Treadmill speed restrictions

Hey, (#humblebrag) but I’m a 15:40 5km runner and my run workouts for Zwift Academy Tri have some of my intervals set at 4:50mm pace. Physically this isn’t an issue but it’s not mechanically achievable on the treadmills at my gym. Their max speed is 20kph. I assume it’s probably not safe to run that fast on a treadmill either. Will this be detrimental in successfully completing certain sessions…

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