Excersise is fundamental to our physical and spiritual beings, I can't imagine being a healer and not being engaged in some kind of physical activity to move the energy around in my body. I have done many different things, from yoga to resistance training, martial arts, capoera, running, I even did a breakdancing class yesterday. Excersise, on a physiological level, releases all of those positive chemicals and hormones into our bodies. Excercise really helps to detoxify the body, move stagnant energy, and of course, put you in a positive mood, all of which make you a better healer. And I find that it ties into other practices, like using plants/entheogens etc. for meditative and journeying purposes; meaning that when your body is clean and responsive to eliminating toxins, it can respond better to the effects of using plants or entheogens. Your mind is clear, and you can ground more easily. You can come back to the physical plane more equipped to integrate your experiences for yourself or for the benefit of others.