I've recently finished the couch to 5k program, achieving being able to run 30 minutes continously (running around 5.6km in that time so running 5k in about 26 minutes). During this program, I was running every other day to get through it with the motivation of finishing the program. I never enjoy starting to run or even running but love the feeling of having finished the run.
My question is how do I maintain my current speed and distance without losing fitness with the minimal effort possible? Would running 30 mins straight twice a week suffice? or could I shortcut to interval training for one run (10 mins at a faster pace then 2 mins walking, repeating for a total of 40 mins) and run 2 of each week be 30 mins continous?
I know it depends on the person but I'd like to know on average, would that be enough?
I don't think I have much interest in massively improving my speed or working to a 10km as I'm already fairly underweight (and too much high intensity exercise kinda messes up my stomach) but definitely want to maintain what I've achieved so far.