About a year and a half ago (and having quit smoking six months prior) I decided to lose weight because my bathroom scale told me that I was on the lower end of the "obese" category. Since then, through a mild but strictly-kept diet (cut off sugar completely, kept bread and similar products to a vanishingly small amount) and a less sedentary life style (doing things like taking the stairs instead of the elevator, taking frequent hour-long walks, occasional cycling or jogging, and occasional light body-weight workouts) I managed to reach the lower end of the "overweight" category.
Although the weight loss was consistent, it was also quite slow. So I started working out more seriously in the past two months or so. I do a light home workout 2-3 times a week, mostly body-weight like lunges, push-ups etc. but I also use a pair of dumbbells for the muscles that are hard to target with such exercises. I also run 5-6 kilometers once or twice a week. I've been quite persistent and I'm seeing a nice improvement: I've lost 6 kg in the past six weeks or so. I'm now very close to my recommended normal weight and feel quite healthy.
Both of my workout methods (home exercise and running) takes about 30-40 minutes per session. That's about the most I want to spend. But I'm near the point where it feels almost too easy. I don't want to increase reps or the distance because I don't want to put more time in it. I know I can, for instance, try harder variants of pushups, increase weights, or run faster but my question is precisely that: Do I have to?
The main reason I workout is to have better health. Appearance is a secondary consideration for me. What if I kept my current training schedule ad infinitum even if becomes easier and easier to do? To be honest, I don't like working out very much. But 30 to 40 minutes per day is something I can do forever, especially if it doesn't exhaust me. Is it still beneficial? Or how much less beneficial will it become in time?