Rowing is an excellent, low-impact exercise that combines resistance training with a rigorous cardiovascular workout.  It targets the entire body and you don't have to be on the River Thames to get a great rowing workout.  Rowing machines come in a variety of models and many are priced incredibly affordable and require very little space.  Many are so compact as to be easily tucked away when not in use.  The amount of resistance on indoor rowers can be adjusted easily allowing you to customize your workout based on your fitness level and slowly increase the resistance level over time.  The sliding seats on rowing machines afford the thighs and calves with a terrific lower body workout and of course, the rowing motion targets the upper body.  One hour of rowing either on the water or on the rowing machine can easily allow you to burn between 750 and 800 calories. You will not find a more convenient way to get a whole body workout than an exercise rower.