Breathing exercise: the balloon
Imagine that your belly is a balloon. This balloon starts at your pelvic floor and goes all the way to your diaphragm. Every time that you breath in imagine that your balloon is filling in with air and expanding. Every time that you breath out imagine - or better, feel - the balloon emptying.
Extra tip: give a colour to your balloon. If you imagine it red you can use this breathing exercise to energize the pelvic region and bring awareness to your belly. If you imagine it blue you can use this exercise to cool down after practice.
Note: Do not force the movement. Use only your imagination and the natural flow of breathing throughout the entire exercise.