My routine is simple and designed so that I will continue to do it for years - so far three years and going strong.
Walk and/or run four to six days a week. If you feel like running, run, if not at least walk for an hour.
Put a chin-up bar somewhere in your house that you pass several times a day - for me it is my closet door between my room and bathroom. When I started three years ago, I just did one-pull up every time I passed it, every other day.
Since I work at home, on some days I would do scores of pull ups every day, in sets of 1. Now I do 5 pull-ups every time I pass it - some days into the 100s. Every other day change the grip; palms out, palms in, hands apart, hands close in and once a week pull-up behind the neck. The behind the neck ones take some time so don't push yourself.
The days you don't do pull ups, do some crunches. I do three sets of 12 traditional crunches and three sets of 12 (actually 24 total - 12 to each knee) of bicycle crunches - do a Google for description.
That's it. Keep it very simple and not too structured. At least do the hour walks and run when you feel like it! My goal was sustainability. I wanted to have a level of fitness that was balanced and did not require a gym to maintain. Elaborate schedules and routines are not my deal and led me to quit in the past.
What I have found that diet is just as important as the exercise. Chris is right on regarding "Cut out sugars and refined grain and focus on veggies and lean protein. You will feel better, loose weight and feel satisfied." I also eat a lot of fruit too, as fruit's sugars are slow releasing and do not slam your body, but must be processed by your liver.
Keep it simple, not too strenuous and sustainable! Do not rush! The hour walks are good for the mind and the body, too!
Also, what works for me may not work for you, so YMMV.
FWIW.
Best,
Kurt