Forget the gym! If you are already spending the weekends catching up with the house chores, chances are there're plenty of opportunities for you to get a sufficient workout, without even leaving home!
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Wiping the Windows
Scrubbing the Bathroom Floor
For extra fitness boost, try placing your hands on the edge of the sink, and do some push ups between scrubs for 15 minutes (yes, you burn 55 calories). Make sure the surfaces are dry, a blue black on your forehead is not pretty!
Make your vacuuming more intense with some single leg lunges. Keep your upper body straight, step forward with your right leg, and lower your hips until both knees are bent at 90 degree. Keep your weight in the heels as you push back to the starting position. Repeat for 20 times, before switching leg.