Yoga has long been considered an excellent, low impact way of improving one's fitness.However chances are that if you can't get to a gym, you probably can't attend a yoga class.It is a good thing that you can practice yoga in the comfort at your own home.
Find a flight of stairs to run on. Go up as fast as you can, then walk back down.Doing this repeatedly will give your lower body a good workout.Just make sure no one catches you if you try this at office.If you have got one of those large exercise balls at home, you can give your core a good workout by sitting on one.
I hope this help you!!