Alpha Monster Advanced Your workout should leave you feeling refreshed and energized, not exhausted. It's important to focus part of your workout on cardio exercises. If you're up to it, you can even include strength training.Stretch your muscles between each set while you workout. Target 20 or 30 seconds of stretching. According to research, those men who stretch between sets increase their strength by about 20%. Stretching can also reduce your chance of injury.