Because stretching helps you avoid injury, you don't have to worry about the time it would take for muscles to heal, which would keep you away from weights for an unknown period. Stick to your cardio exercise. Although cardio exercises might seem to contradict what it means to build muscle, this type of exercise is crucial for proper heart health. Three 20-minute cardio sessions per week will help you … These exercises use many muscle groups in the same lift. …

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