Muscle tone refers to residual tension in a relaxed muscle and increases with cardio and resistance training. Generally the stronger you get the harder your muscles will be. There are two methods that can be used to produce high tension in your muscles.
1) Lifting heavy weights (using maximal or near maximal loads) at low speed
2) Lifting moderate loads at high speeds – explosive movements
If you have high percentage of body fat that is covering your body, you won’t be able to see muscle tone until you lose fat.
I am a big fan of circuit training with combination of high resistance training and cardio, that will save you time and give you all the benefits of both styles to optimize muscle tone and fat loss.