(Not really -- hopefully everyone can benefit from this post)
Today we’ll think about some ways that can help you with better posture, but first let me say that if your back is very curved when you row, and if you’ve been rowing that way for a long time, you’ll probably have to seek the assistance of a physical therapist who understands the rowing stroke in depth in order to make changes in your stroke. That’s because the muscles that you’re going to be using to maintain good posture are very weak and underdeveloped, and they won’t be able to stand working for very long during even a regular steady state workout that wouldn’t faze your legs a bit. If you try just rowing differently without first spending some time reactivating and strengthening those atrophied muscles, you’ll spend most of your time on the water getting back into your old habit, and thus getting better at it instead of the new way of rowing, and that will lead you down a path of diminishing returns. But if you take the time away from rowing to build up those muscles while staying fit in other ways, then when you come back to the boat you’ll be able to maintain those changes during a practice (with the help of a good coach) and you’ll get out of the cul-de-sac you’ve been rowing yourself into.
As always, of course, if you experience pain (not the kind due to the acidosis of exercise), you should also see a physical therapist. And though I’m fairly knowledgeable when it comes to good rowing, I’m not at all knowledgeable when it comes to rehabilitating injuries. So don’t take what I say at face value; research it yourself. Discussion is always welcome.
One of the best tools you have at your disposal is the erg, plus a mirror in which you can see yourself from the side. (Visual cues tend to be the most robust, so try to invent them for yourself when possible.) Start out at the catch, but don’t hold the handle. Just watch what your lower back looks like when you’re compressed to the point that your shins are vertical. If you want a really nice image of how to and how not to look, check out this picture* of the Greek lightweight women’s double from the Olympics that Sportgraphics took. See the outline of the stroke’s back, from just above the gunwale to the white part of her uniform? Curved! It’s not the worst I’ve seen (sadly), but not what I would like if she were my sculler. But take a look at the same region of the bow seat’s back. It’s obscured a little by the oarlock and collar, but you can still get a sense of how much straighter her back is. That’s what you want to aim for.
To achieve it, start by leaning forward from the hips, not the waist with your legs straight but not hyperextended. If you really want to challenge yourself, put a 12” ruler down the back of your shorts to act as a guide. Just make sure you do it in complete isolation, or you’ll never live down the mocking. With your back in that position, pull your heels toward your seat. You’ll need to contract your butt and your hamstrings to keep your lower back in that position. When your shins are vertical, you’ll also benefit by imagining that your belly button is snapped to your thighs. See if you can move your seat back and forth on the rail, keeping your back (from the butt upward) in the same position.
Memorize how it feels to keep your back in that position. It might feel like you're arching your back a little, if your back is used to being curved in the opposite direction. But if your back is guided by the ruler or your eyes so that you make sure it's straight, it won't actually be arched.
Now, pick up the handle. At, like, zero pressure, very gently, slowly, and precisely do the same thing (roll your seat back and forth with your back in body angle position, with your lower back like the Greek bow seat). You might want to close the vent on the erg to make the load lighter. You can work yourself through a hierarchy of pressure, gradually increasing it, but still maintaining your perfect posture. If you can maintain it, try taking a few full strokes. On each recovery, now, you’ll have to check your posture and adjust it if it’s not good. Feel, as you do these light movements and check your posture, how your abs, hamstrings, and glutes work together to stabilize your pelvis as you sit on the front edges of your “sit bones”.
If you’re having trouble keeping your posture, something I’ve been meaning to try is this: You know those back braces they make Home Depot workers wear? They look sort of like short, industrial bustiers. If you have access to one, wear it with the stiff part in the front while you try the previous exercises. It doesn’t have to be tight; it just has to be rigid in front so you won’t be as tempted to bend your waist. If you don’t have one of those braces, try a weightlifting belt – again, if it’s one of the ones with a wide part that most people wear in back, turn it around so the wide part’s in front. It’ll feel uncomfortable if you bend forward at the waist, which is the point. (You can also wear your weight belt this way, only tight, when you lift. The function of a weight belt is to stiffen your abdomen to make it less likely to bend forward as you lift and to enable you to get higher intra-abdominal pressure as you do the val salva maneuver, which also stiffens your midsection.)
Memorize how the posture feels when it’s right – get up take a drink, get back on the erg, and row a few strokes eyes-closed. Then check yourself in the mirror. Invent a way of self-monitoring that you can take into the boat, and test that out. Get someone to look at your posture on the water and compare it to the Greek bow seat.
I hope that helps, y’all. Lots of fans said that Maria Callas’s voice was excellent, but the way she sang probably gave her vocal fold damage and ended her career early. So if you like rowing and want to do it for a long time minimizing the risk of injury, working on your posture sure will help.
* I had a hard time getting a good url for this photo, and the one I include up there only gives you a small version of the picture. Here's a more complicated way to get a larger version: go to www.sportgraphics.com and click on "Olympic Games - London" in the list on the left. For "Schools" choose "Greece", and "Events" choose "Women's Double". Scroll through with the little double arrows at the top till you're at the 4th page of 6; the first picture on that page is a larger version of the one I linked to above. Its PhotoID is 2012-OG002-585.