For eating, I cut out as much sugar as I reasonably could. For exercise, I made sure I "moved vigorously" for 30 minutes per day, every day.
I was never a runner. And in my early shape, that 30 minutes was just me walking. Eventually, though, I stopped sweating and being out of breath, so I started walking more briskly. Then eventually I moved to a treadmill and started jogging for bits of it.
And then I could jog the whole time. And then I could run while taking jog breaks. About 7 months in, I was able to run 5 miles in about 35 minutes. I did it every day.
The point was that I went every day. It wasn't about how much I did, but that I was sweating and moving for 30 minutes. Lost 75 pounds in about 9 months.
I took the winter off last year and fell into sugar again, so I restarted this past summer. A 5k every day, as many days as I can. I have to run outside instead of at the gym, so weather controls a lot.
All of this is to say I agree, mostly. 30 minutes per day every day can fix a lot of problems. It did for me. :)