Brad Kearns tackles listener/reader Q&A. Topics include the disparity in perceived effort between cycling and running at aerobic max; what is the 'low-end' heart rate for aerobic workouts (the answer will surprise you!); integrating Primal Endurance principles for Spartan Race competition; how stubborn excess body fat might be there as a consequence of too much exercise, not too little; and much more!   Email [email protected] if you have a question for the show. And please take the time to submit a review about the show on iTunes or Stitcher. Thanks for your support!