I don't think sweat is a great judge of effort (but always satisfying, isnt it?). You are in muscle endurance prep on week 1, I don't really remember sweating much until later. As long as you figured your maximum (one rep possible) weight and are doing about 60% of that, you are doing it right. The No Cardio rule is to focus ALL you fuel for muscle growth. She doesnt want you doing cardio because it robs fuel (and sometimes cantabolizes muscle) from muscle growth. More muscle increases metabolism and increases fat burning. Phase 2 becomes a balanced fat burn-muscle growth plan and Phase 3 kicks in high fat burning while maintaining as much muscle as possible.
That said, a lot of people (not me) have been doing cardio during phase 1. My suggestion is to try to stick to low intensity exercise (like yoga or a walk). If you do medium intensity exercise than I suggest adding more calories so you have enough fuel for both.
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