One of the most complete cardiovascular exercises around has to be rowing. A proper workout on a rowing machine will tone all of the major muscle groups such as your legs, back and arms. The beauty of using a concept 2 rowing machine is first of all it doesn't involve water. This rower doesn't get you wet and there are no early morning trips to get your machine out of the boat shed. No cold changing rooms and gale force winds for your training session. And there is definately no need to find the nearest river to row your machine on. All you have to do is set it up in an adequately spacious area and away you go. There are lots of different machines available on the market. Although they generally fall into 2 categories: -Water rowers -Air rowers The water rower, which contrary to their namesake, does not end up in you getting wet after a vigorous workout. The machines are very beautifully designed and use enclosed water and paddles for resistance as opposed to air. These rowers tend to be quieter than air rowers and are just as much works of art as they are exercise machines. Then we have the concept 2 air rower. There are many other brands available but this piece of machinery is commonly accepted to be one of the best, if not the best. They are engineering masterpieces and are all calibrated to the same standard. So, if you do a certain time on a concept 2 rower, you can rest assured that, that time will be replicated exactly on another concept 2 machine. This is the reason why the world indoor rowing championships use the concept 2. The information that the display monitors show on the concept 2 is extensive, with the new monitors even being able to be plugged into a PC, so you can race with other rowers from all around the world.