Your planned workouts use time (duration). So please follow the workout guidelines relating to duration rather than distance.
Training with duration is a safe way to ensure that your ramp rate (the rate at which your fitness increases) is set consistently over the weeks/months of your training plan.
This ensures that you can achieve your weekly training goals without risking over/under-reaching, or leaving yourself vulnerable to injury.
You can imagine - if your plan asked you to run 5 miles for a long Zone 2 run. How long you take depends on your fitness, the route you choose and the conditions you are running in.
One week, the same distance might take you plus/minus durations (considering variable conditions such as elevation, running buddies and weather).
The best way to ensure smooth and safe progression is to follow workouts according to duration.
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