Our expert says:
Let's hope that there's nothing wrong technically with the treadmill :)
Secondly, training for 5km run should be atleast 6 weeks before the race.
To confirm if your heart rate is an issue, I agree with the previous reply regarding the Karvonen method: 220 - your age, in determining your maximum heart rate, therefore you should not exceed this maximum heart rate.
Remember to pace yourself with speed, incline and time. Increase a 1km run every week.
Hope this helps.
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