LOSING WEIGHT WHILE BUILDING MUSCLE. Three months with me, and I promise you that you will improve your performance: good muscles level, good cardiovascular resistance, flexibility, and most importantly, self-confidence. We sometimes forget the importance of good muscle levels. Muscles are the tool that keeps our body moving. Working out your muscles is also the most effective way to lose weight. One sesSion of strength is most effective than two or three cardio sessions without downplaying the importance of cardio.