There are a lot of exercises you can do on your own without expensive equipment.  All you need is to schedule your time and have fun with it.  Rather than using a timer to keep track of your time it is sometimes easier to turn on the radio or pop in a CD.  Then say to yourself,  "I will exercise for 8 songs!"  8 songs is roughly a half hour.  Plus if you are doing an exercise that you don't particularly like you can at least sing or hum along to your favorite tunes.  Here is HOW!

        Pull UPS!                    Jumping Rope            Push Ups                                Jumping Jacks            Sit Ups