Hi Nidhi,
The two main type of exercises are aerobic/cardio programs and resistance/strength training programs. Each program acts on your body in a different way, so they should be examined separately to determine which is best for promoting weight loss.
An aerobic program usually consists of various forms of cardiovascular exercise performed three to six days per week. Assuming each session lasts 30 minutes and you are working at a moderate intensity, the caloric expenditure is easily about 300 calories per session. Now, compare a cardio session to a resistance training session of equal duration. The resistance training session will burn less than half the calories of the cardio session. The main reason for this is that during the cardio session your heart and your muscles are working continuously for 30 minutes. In a strength training session, after you take away the rest between sets and the rest between muscles worked, you are really only working for about 10 minutes.
However the Resting metabolic rate (RMR) has been reported to remain elevated for 10 to 15 hours after a resistance training session. After following a resistance-training program for some time, your daily RMR may also increase as you build more muscle.
So, follow a program that includes a combination of both strength and cardio training. This way you will receive all of the short-term and long-term benefits of exercising.
Read more:
http://www.lifemojo.com/lifestyle/exercise-and-weight-loss-4614156