Turns out you can pull 15 calories on a Concept2 Rower in just six pulls. 

Shane Farmer and the team at Dark Horse Rowing discovered a hack for the C2 Rower that allows you to very easily pull 15 calories in six pulls in around 35 seconds. Check out the detailed walkthrough from Dark Horse Rowing.

The trick involves setting the damper on its lowest setting of one, and then taking one strong pull every seven seconds. 

The pulls should work out to be something like this: 

Pull 1 = 0 Cal

Pull 2 = 2 Cal

Pull 3 = 6 Cal

Pull 4 = 9 Cal

Pull 5 = 12 Cal

Pull 6 = 15 Cal

While this seems awesome, it's also important to note that it's definitely cheating and isn't a technique that you should use in any real form of competition. It's merely a cool glitch with the C2 Rower that you can show to your friends. 

Since the discovery of this glitch, the founder of Concept2, Peter Dreissigacker, has shared this statement on the matter: 

"There is a time limit, programmed into the monitor, of 6 seconds from the finish of a drive to the start of the next drive. A delay of more than 6 seconds signals the monitor that you have stopped rowing. (Among other things this allows a user to pause to take a drink or pull off a sweatshirt during a long row, and then continue the row). The monitor’s self-calibrating function uses the completed stroke cycle (drive, recovery, drive) to determine the drag factor to use in calculating the correct data you see on the monitor. Unfortunately, by pausing for 7 seconds before you start your next drive, the monitor assumes you have stopped rowing… and the monitor never “sees” a complete stroke (it determined you had stopped rowing before it could sense the end of your recovery). If the monitor never “sees” a complete stroke, the drag factor will not be correctly determined and the data displayed will not be correct. In terms of getting a valid score, what are you are doing here is like painting “45” on your 25-pound weight plates…"