Q and A: High Rep/ Low Weight Effective?

Hi I have enjoyed reading your blog. I have a question for your consideration. After about 4 years of traditional training (2 times per week with a personal trainer plus additional training and cardio on my own), I decided to try something different. I have been doing the “Tracey Anderson Method” videos (low or no weights - mostly body weight and high reps). I like the results I have seen (more definition, new “cuts”, longer leaner lines). I also do some pilates and yoga, swimming, and runn