Or should I say the importance of your feet in paddling. I think that one very important element that might get overlooked for new paddlers is how your feet help to propel your boat. There might be a few different opinions on the subject, but I think most experienced paddlers will agree that when your right hand blade is providing the forward motion, you need to have that energy transferred down your leg and to your right foot that should be firmly planted on whatever type of foot rest the boat has. The boat will still move forward without the foot being planted, but you are going to lose some of the efficiency if the energy (force) is only being transferred to the boat through the friction of your butt on the seat.
In actual practice, you will pump your legs to coordinate with which blade is in the water to some degree–rather than applying steady pressure at the foot rests all the time. In a more relaxed paddling mode, you might find that your legs and feet also are more relaxed and the pumping of the legs is much reduced.