There is a _long_ discussion about how much exercise helps weight loss, what kind of exercise is better (aerobic vs anaerobic, burning calories vs building muscle, priming the metabolism vs getting hungry), how much is enough etc. It's much safer to skip it altogether.
Well, overall the goal is to burn more calories than you take in. I wouldn't recommended "skip exercise" to anybody, but tell them that it's not necessary if they can control their intake enough. But, if you don't change your intake and also add exercise, it'll certainly speed things up.
