Rowing is a fantastic all-round exercise. In fact, rowing can burn up calories quicker than something like biking and most row machines are now easier to store than an equivalent indoor bike.
The good thing about rowing is that done correctly it is a smooth movement which burns the fat without giving damaging impact to your joints. This is a particular problem for some other forms of exercise and is especially important if you are suffering from any knee problems.
Of course you will find that rowing will even help to trim those bottom muscles and since it works both the back and abs muscles at the same time, it can be a particularly good way to lose those love handles and get a flatter tummy while still balancing the counteracting back muscles.