Waff App Exercise #11 Ab workout for abdominal muscles and improved seated balance. 5 rounds of 20 second-holds with a 2 minute rest between each round.   Slowly inhale as much air as you can and then start to exhale as much as possible These are isometric contractions are extremely effective. Abs killer! Try our free app today, link in Bio ☝️ #waffminiclassic #backmuscles #frontmuscles #core #situps #absworkout #absmusclebuilding #absmuscletoning #absmusclestoneprogress #absallday #absalldaylong #6packtraining #6pack #buildinga6pack #posture