This is wonderful - thanks for sharing! I am a fitness competitor and bodybuilder...also a VERY anxious person. Throughout my training, I've found that doing 5-10 minutes of yoga before and 5-10 minutes of meditation after has helped a lot.
I agree - visualization while exercising is an awesome tool! While I'm doing cardio, I usually listen to motivational speakers which has also been QUITE beneficial.
Happy training!
RE: The relationship between exercise and anxiety: from someone who has been there.