I am happy to have found Dragon Boating as a passion in life. I coach for the Tacoma Dragon Boat Association and enjoy sharing and learning all things paddling.
http://www.paddlingcoach.com
Plyometric exercise, in which a muscle is loaded/stretched and then contracted in rapid sequence, helps build our fast response, and power. Paddling is a good Plyometric exercise in itself, but there are a few techniques we can employ that aid the loading, and add to the benefits.
When paddling, transferring weight to your blade is important, it helps drive your blade, adding to a positive catch, reducing cavitation and it lightens the boat. What it does when done well, with a positive blade angle, is load and stretch your muscles prior to contraction at full reach, in effect making all paddling Plyometric. Concentrating on top hand drive, weight transfer, or a solid catch, all have the ability to produce the desired result. Work out what terminology you want to use, stick to it, and make this a mantra.
Short push-pulls, at the front of the stroke, are a good Plyometric exercise as well. Start about 12-18" back from full extension, blade fully burried, paddle vertical, then aggressively push through the water up to full extension. Once at full extension, powerfully, but minimizing cavitation, pull back to the starting point, then repeat. As coach, you need to set the pace and timing for the crew. Be careful to keep the speed at a level that powerful strokes can be maintained, not too fast, or too slow. Make sure that full extension is reached. Provide a loud call for push, then for pull at full extension, and try for consistent, accurate timing calls, so paddlers can get the best benefit.
Begin at mid-thigh, or the end of the stroke in the water, then do a push (like a push-pull) up to full extension before initiating the racing start. The racing start then begins with the boat moving backwards, this will help load and stretch your muscles, increasing their power output on the initial pull of the start. Again, the call is important as timing is important here too. So, “Paddlers prepare… PUSH!… GO!” with appropriate pauses and volume, timing “GO!” With full extension.
You are already very familiar with Plyometrics. Running is a plyometric exercise, so is jumping. What we know is that the larger and faster the load can be placed on the musculature, the more explosive the response. Picture a basketball player taking a few steps before jumping for a rebound, the added momentum of movement is translated into faster and larger load on the legs, as (s)he squats down stretching the leg muscles, to aid in the jump.
By loading your paddle faster and heavier before your pull, the resulting stroke will be even more powerful. If you can get that loading done while fully rotated and extended, the load is carried by many muscle groups, the quads, hamstrings, glutes, back and abs. Lots of big muscles! Keep the blade at a positive angle on load to aid in the stretch of your muscles, and adding to your explosive power! Plyometrics will aid your response times, speed and power. Both by training your muscles to react, and by training your body and mind to remember to act on the principle.
Remember, the faster and heavier the load on the blade at a positive angle, one that extends your reach and stretches your muscles on catch, the faster and more powerful your pull will be.

Rotational results are sometimes hard to achieve. We utilize rotation only strokes during standard drills in order to emphasize the importance and power derived solely by rotation. When paddlers achieve results directly derived by rotation they begin to learn the importance, but this does not mean that they will remember day to day.
Providing rotational muscle memory is the coaches' role. There are many ways to do this, and I have my own bias, but the key is to make rotation a non-issue by reinforcing it over and over. Conducting rotation drills early in the practice reinforces rotation for the rest of the practice. Notice when rotation starts to fade, and provide a reinforcing drill at that time.
In sports there is a concept of specific focus that can aid players in increasing their results overall. The concept goes like this, imagine you are a golfer with a 150 yard shot to the green. If you are focusing on the length of shot or the correct club selection, you may not make the best shot, but if you are focusing on hitting the ball on the third dimple to the lower left of center, you will more likely hit the ball the way you should. What is acting here is very specific focus to an area, and that takes all distraction and worry out of the picture.
For an effective drill to teach both the importance of the catch and to focus on positioning the body, Body Weight Pulls are a great tool to utilize.
Set up the drill by demonstrating the proper technique for the catch. The concept is to start the stroke without pulling, but to allow your body weight to drive the paddle down and the boat forward. Start with body weight for the first 75% of the stroke, with physical pull for the last 25%. do this for 20 or so strokes. Next move up to 50% of the stroke as body weight, 50% pull, again for 20 or so strokes. Prgress like this up to full pull.This will also likely produce a different entry, a smoother one! It emphasizes the proper feel of compression on catch. There should be no cavitation as there will be good water both in front and behind the paddle.
Body positioning is also something that can be integrated into this drill. When setting up maximize rotation and reach to maximize body weight on the paddle.
Have fun!