Training should be a mix of easy and hard workout sessions. In some training sessions you will go flat out, and you need to do this occasionally in order to build your anaerobic conditioning, but you also want to make sure you don’t over exert yourself too often.
Remember that when you are training, you should be aiming on working at no more than an average of 75 to 80% of your maximum capacity.
You’ll need an experienced running coach to help you with your running style, but over exertion is something you can easily manage yourself.
As a general rule of thumb you can monitor your level of exertion by keeping an eye on your heart rate. The easiest way to do this is with a heart rate monitor, but when you have used one of these for some time, you will get to know your body and you’ll be able to feel when it has reached the level of performance you are looking for.
How to work out your maximum heart
As we get older our heart rate slows down, so this is different for everyone. There is an easy formula, which is 220 minus your age. So if you are 20 years old, your maximum heart rate around 200 beats per minute. For me at 49 years of age, my maximum heart rate should be around 171 beats per minute.
So in training, I’m looking to do no more than 80% of that. This will help to ensure that I don’t overdo my training and that on the day of the event, I’ll have a little in reserve to be able to put in a better performance.
<< Back to the City2Surf Training Program
About the Author
Chris Edwards is a Communication Strategist and Executive Coach. He is the youngest City2Surf Legend - testament to the focus and tenacity that has powered him over the line year after year.
Like to know how a Communication Strategist and Executive Coach can help you? Contact Chris now for a confidential chat.
Last 5 posts by Chris Edwards
- Simple ideas that work
- Don’t let anyone Lara Bingle you
- Breaking the glass ceiling on my morning run
- Breaking your glass ceiling at the gym
- Breaking your own glass ceiling
Tags: city2surf training

Hi Chris – good post!
I also like to monitor my runs via heartrate, but one of the issues I have is that my training courses have quite a few hills. Hence my heartrate tends to stay well below 80% max on downhills, but frankly sometimes I’d have to break into a walk to keep it below 80% on the uphills, and I often let it go up to 85%+. So do you think it OK to *average* no more than 80% over the entire run, or do you rather think its better to avoid going over 80% at all (apart from during occasional anaerobic workouts)?
Hi Graham,
My rule of thumb is to average around 75 to 80% over the course of the run. When I’m running uphills my heart rate often goes above the 85% too but as you say, on the downhill your heart gets a well earned rest.
I think a lot depends on the length and grade of the hill. If you have a very steep hill, even a very fit person can reach 80% or more of their max heart rate just walking up it.
There is no shame in walking up a hill if your heart is doing 80%+ because you are still getting the aerobic benefit but you also need to run some of the hills to work your muscles. The running action needed for hills is different to the flat, so I think of hill running as being more about working the muscles than for it’s aerobic benefit.
Cheers