Keep this main idea in mind. The high-volume toning approach does not properly train muscles. It's a waste of time and energy. The very brief, high-intensity approach provides the necessary stimulus for strength and muscle increases. Once the stimulus has been provided by your efforts, no more exercise is required.
Additional exercise is unnecessary.
It's not a question of how much exercise you can possibly tolerate but exactly what is the correct dose of exercise that is required to make improvements in strength and muscle mass. Women who slowly and modestly gain more muscle will change their body composition. Such women will have more lean body mass and less fat. If you're one of these women, you'll look a lot better. Now here's another key point, and it's closely related to the fear of getting too big.