Take 12 minutes out of every day.  If you need to, you can even get up 12 minutes early.  Most people can find at least 12 minutes every day. 

There are several strength training routines that can be accomplished in just 12 minutes.  Consider investing in a set of free weight and home gym equipment if you don't already have some.  The key to fast fitness is attention to form.  When you
are working out in just 12 minutes, you must perform each set of exercise you do flawlessly to get an effective work out.  When lifting weights, take 4 full seconds to raise the weight, and 4 full seconds to lower the weight.  This is critical to the effectiveness of a 12 minute workout. 

By slowing down your movement, you take out any momentum and without momentum, only your muscle is working to move the weight.

Anybody can easily perform 4 exercises with perfect form in 12 minutes.  If you add just 12 minutes of cardio vascular activity, even jogging in place, you'll get fitter even faster.  You don't have to work out each 12 minutes consecutively; consider 12 minutes in the morning and 12 minutes in the evening.

Strategies for Losing Weight

There are many lifestyle changes that you can incorporate into your life that will also help promote fitness in time crunched times.  When going to the grocery store, rather than drive around for hours searching for the closest parking spot, park
in the one farthest away.  You're body will appreciate the extra effort it takes to get to the store and you'll be exercising without even thinking about it.

Also take the stairs whenever possible, particularly if you are just going to the second floor.  This little bit of activity will also act as a mini energy re-charger.  Stairs are everywhere.  If you are near an escalator, chances are the stairs are right around the corner.  You might even have some in hour house.  Have the kids climb them with you.