When it comes to exercises, not all are created equal. While we all may have our favorites, some are better known to be more effective at getting the job done than others. WebMD [1] has created a list of their top seven (odd number, eh?) most effective exercises [2] and here are highlights:

• Walking. Any exercise program should include cardiovascular exercise, which strengthens the heart and burns calories. And walking is something you can do anywhere, anytime, with no equipment other than a good pair of shoes.

• Interval training. Whether you're a beginner or an exercise veteran, a walker or an aerobic dancer, adding interval training [3] to your cardiovascular workout will boost your fitness level and help you lose weight.
• Squats. Strength training [4] is essential, the experts say. And our experts tended to favor strength-training exercises that target multiple muscle groups. Squats [5], which work the quadriceps, hamstrings, and gluteals, are an excellent example.

There are more effective exercises so .

• Lunges. Like squats, lunges [6] work all the major muscles of the lower body: gluteals, quadriceps, and hamstrings. Lunges are a bit more advanced than squats helping to improve your balance as well.
• Push-ups. If done correctly, the push-up can strengthen the chest, shoulders, triceps, and even the core trunk muscles, all at one time.
• Abdominal Crunches. Who doesn't want firm, flat abs? Experts say that when done correctly, the familiar crunch (along with its variations) is a good choice to target them.
• Bent-over Row. Talk about bang for the buck: This exercise works all the major muscles of the upper back, as well as the biceps.

So which do you do? I do all seven — w00t, w00t!

Source [7]