There are basically two types of workouts: cardio and strength training, and each of them has its own place in the big scheme of fitness. If your aim is to lose weight by burning fat but don't want to get any heavier, cardio maybe the best exercise for you. Strength training exercises are best for toning up your body, building muscle tissues, etc. If your aim is to lose weight as well as build muscles, strength training workouts maybe the way to go.