One of the biggest and most common mistakes people make when they take up running is they try to run as far as they can without stopping, and next time try and beat that. It may work for you but mostly it doesn’t. Why, because it is a very negative way to go abut it. Running to failure, and then hoping to fail a little later next time.
If you are starting running, think about starting slow, and before you even start, slow that pace down again. If you run flat out you might run for 2 minutes and then collapse after crawling home.
What if you ran really slowly for 30s to a minute, then walked for 1min to 90s, and then ran again for 30s-a minute and walked again and kept doing that? Chances are you could do that 5-10 times, by which time you have run for a total of 5-10 minutes, not 2! In addition to that you have walked in between and gained the benefit from that.
Roughly speaking you burn the same amount of calories walking a mile, as running a mile. It’s the same distance whatever the speed! And how much more rewarding and satisfying is it to come back feeling fine having exercised for 20-30mins as opposed to 2 minutes. Slowly over the weeks you can increase the run, and decrease the walks until before you know it you are running 30 minutes non-stop and not only that but enjoying it too!