Please help!! This is a P.e question

1. In order for your body to make the physiological changes to improve itself, which concept/s must be applied regularly?

2. In order for you to improve your speed, you must use exercises that directly address it. Which principle is this?

3. When your body becomes accustomed to a specific demand, the demand must be systematically increased. Which principle is this?

You don't have to answer all of them anything will help.