____no5
Free Man
I am also trying to run 10 km under 45 minutes.
Absolutely doable for you, even borderline not ambitious haha.
I need to increase my stamina.
For stamina secret is to run longer and (much) slower. The improvement is not as immediate as with strides though, it will take you a couple of months to see tangible results.
If you could add an hour run at an average heart rate of ~135bmp -which in your case could be real slow, even with some intermediate walking to keep the heart low- you'd be surprised with the results.
Consistency is the key though. Try not to loose sessions.
If you stick with 2 strides + 1 long run + 1 cheat run (anything you like, but ideally average heart rate not more than 145) for 2 months you will built a good base to then follow a 40 days program with intervals instead of strides and destroy the 45 minutes barrier.