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Its worth getting outside if you can, but a treadmill is still a valid way to get the miles in.
Jo - I did most of a couch to 5K type programme on the treadmill. It makes it a bit easier in terms of where you finish. I was never quite sure where to go to ensure that I didn't have a long walk home. Definitely try to get outside sometimes as the treadmill can be quite boring and it is a tougher outside as you have to deal with a less than flat surface plus the weather.
All the best. Remember it takes time to get used to running so try to persevere when the going is tough.
Absolutely. Usual advice is to put the treadmill onto a 1% incline to slightly increase resistance because inside you're not getting wind resistance.
Jo, do what's best for you. A lot of people will say stay away and get outside but that's not always practical. I used my treadmill a lot when jnr was first born and Mr worked in London so I didn't have childcare.