I run 5km 2-3 times per week as part of my cardio day at the gym. I have a routine of setting the pace at 6 minute kilometres initially and increasing every km. For example, the pace in minutes looks as follows over the whole 5km: 6, 5.5, 5, 4.5, 4. This takes 25 minutes. If I’m tired, I’ll run the first 2km at a 6min pace, then increase after that, for example: 6, 6, 5.5, 5, 4.5. This takes 27 minutes.
