General questions about Isometrics

Hi Paul,

I have some general questions for you about doing the isometric exercises presented in "7 seconds to a perfect body".

1- During a session, do we need to take 10 deep breaths between each and every one of the exercises, or just when doing an exercise on the same muscle at different angles?

2- Why is it necessary to make a 10-breath pause between the iso's?

3-Do iso's correct postural deficiencies, such as kyphosis, lordosis, scoliosis, poor posture, and bad hip alignment?

4- Does doing the same isometric exercises twice in a single session overwork the muscle and bring 'negative' results?

Thanks!