Working out at home is a possible answer then. I regularly use and therefore highly recommend the simplefit[1] routines.
It consists of 3 different "days" (endurance, strength and judgement) which all consist of different combinations of pull-ups, push-ups and squats.
All you need equipment-wise is a pull-up bar. I have a wall-mounted pull-up bar which is very stable. Maybe a cheap one for the doorframe will do the trick as well.
simplefit consists of progressively harder levels[2]. If you manage to finish "day 3" (judgement) in under 5 minutes, you go to the next level.
EDIT: forgot to mention that the simplefit exercises are done with bodyweight only. Also, they are laid out in a way that will keep your heart pumping and thus you will get fit pretty fast and in a time-efficient manner. No routine takes longer than 20 minutes. In fact, only "day 1" is ultimately bound by time (20 mins), the others are to be finished "as fast as you safely can". This is key for me and the reason I stuck to it over many weeks now. It doesn't take long and I still see results.
All you need equipment-wise is a pull-up bar. I have a wall-mounted pull-up bar which is very stable. Maybe a cheap one for the doorframe will do the trick as well.
simplefit consists of progressively harder levels[2]. If you manage to finish "day 3" (judgement) in under 5 minutes, you go to the next level.
[1] http://www.simplefit.org/ [2] http://www.simplefit.org/workout.html#workouts
EDIT: forgot to mention that the simplefit exercises are done with bodyweight only. Also, they are laid out in a way that will keep your heart pumping and thus you will get fit pretty fast and in a time-efficient manner. No routine takes longer than 20 minutes. In fact, only "day 1" is ultimately bound by time (20 mins), the others are to be finished "as fast as you safely can". This is key for me and the reason I stuck to it over many weeks now. It doesn't take long and I still see results.