Exercise is a vital ingredient to maintaining a healthy lifestyle, promoting fitness, and losing weight. Especially in an era of rapid increase in the prevalence of weight disorders, it is important to establish a regular workout routine, preferably five or more days per week, and stick with it. As reflected in Borg, et al, 2002, a lack of discipline can often result in a depletion of any success in losing weight.
With regards to whether cardio or weight-lifting is better at shedding the pounds, the answer is both. While various public views and studies pointed to one or the other, the overall consensus highlights the importance of both, as each provides a different aspect of fitness. Aerobic exercise is more likely to cause initial weight loss and increase REE following workouts. Resistance training builds LBM, which is an essential mechanism for burning calories during rest and experiencing long-term weight loss.
For the most successful weight loss experience, integrate cardio and weight-lifting in an intensive workout program. Remember, the effort and time put into exercise directly affects the amount of calories, especially from fat, that can be burned.
http://healthpsych.psy.vanderbilt.edu/web2007/exercisecomp.htm