Use a step for step-ups, the edge of your sofa for incline push-ups and two tins of food or filled water bottles for substitutes for weights.
Remember, lots of your furniture can double for gym fodder. Use a step for step-ups, the edge of your sofa for incline push-ups and two tins of food or filled water bottles for substitutes for weights. The key is to do what you can with what you have.