Run up and down your stairs 10 times. Take 2 minutes off, then do it again. 10 times.
Now here's the fun part. I like to fold laundry or put it away during my 2 minute rest. I start my stairs running at the top of my stairs by my bedroom. That way I can finish upstairs, walk to my room grab a stack of clothes, walk to a different room and put them away. I use a stop watch to signal when it is time to head back to the stairs to do another set. You can also do sit ups, or jumping jacks, or push ups, or anything else. I also like to alternate the stairs with my elliptical machine. Or maybe try tidying your kitchen.
Give it a try. It'll get rid of those winter blues and give you amazing leg muscles!!! Plus you will be able to get some things done around the house at the same time. I was dripping wet by the end of my work out today...and my legs feel tired and wonderful.
Just don't fall down your stairs.
It's not fun.
If you start feeling sloppy, slow it down. You'll still feel the benefit of climbing stairs.