Jumping jacks may not be a popular choice for some people, but they are a very effective exercise that are not just for warm ups. Jumping Jacks can easily be integrated into a cardiovascular workout as well as a strength training workout.

Have you ever tried to do 50 jumping jacks in a row? How about 100? I mean actual jumping jacks and not the cheap version were you only move your wrist back and forth and your legs never leave the ground. If you haven't tried this many jumping jacks in a row before, go ahead and try it now. You will see exactly how much of a cardio workout that you are getting.

If you do a jumping jack correctly you can also get a great workout to strengthen your muscles. By keeping your abdominal muscles contracted the whole time, you are getting a core workout as well. Jumping jacks work your entire body and when you add weights, it takes it to the next level.

Here is how to do a jumping jack:
1. Stand with your arms down by your sides and your feet together. Knees should be very slightly bent and your abs should be contracted.
2. Bend your knees as you jump, kicking your legs out to the sides so that they are wider than shoulder length. At the same time raise your arms up over your head so that the two hands meet right over your head. Your elbows should be slightly bent.
3. Jump your legs back together as you bring your arms down back to starting position.
4. Do not take a break and continue the steps until you have reached your desired repetition.

To add some challenge to your jumping jacks, you can wear weighted gloves or add a light dumbbell to the workout. This makes the exercise more of a strength training maneuver as well.

Remember that although jumping jacks do make a great warm up exercise, the intensity can be increased and they can also make a great addition to a cardiovascular or circuit training routine.