Mark Hargraves

You can go cycling and you'd be hit by a car.

You can go running.

And if you go too hard too early, there are risks of musculoskeletal injuries.

So I think there are lots of people who run very large distances who are free from injury because they monitor how much they do.

They wear appropriate shoes that protect the impact forces on the knees.

They take appropriate precautions.

All physical activity, when it's done to a potential extreme and beyond...

normal capability at a particular time.

Of course, as you train, you adapt and you're better able to withstand those stresses and pressures.

But I wouldn't dismiss running because there is a risk of there being a side effect.

I think you need to monitor what you do, be careful, be clever.

And if you're starting to feel some pain, then take that as a warning signal, back off, get it investigated, get it fixed, and then keep doing what you're doing.

Well, not to over-medicalise it, but I think having a checkup with your GP is saying, you know, are there any particular issues that I need to be worried about?

Most people who are healthy and asymptomatic, obviously age is the greatest predictor of some of these non-communicable diseases that we get.

So if you're a bit older, it's always good to have a bit of a check.

And then start gently.

And then if you need to get some professional advice, you could talk to a fitness specialist about how you might progressively increase.

Now, of course, that information is available online these days, to your earlier point about the sources of information that we get.

The concept of progressive overload is that you start doing something and then as you adapt to that, you do a bit faster or you go a bit longer and just monitor how you adapt to that.

Monitor your heart rate.