These exercises are SPEAKING ONLY to allow you to focus on proper jaw extension, spacing, and breath support, apart from pitch. Through consistent single vowel repetition, you will gain confidence and precision in enunciating singing vowels.
 
SWAL Jaw/Vowel Exercises help you practice proper spacing and jaw extensions on singing vowels.  There's way more than 5 vowels you should be focused on when singing!  And learning to enunciate them clearly and effortlessly, without tongue, face, or jaw tension will seriously level up your singing game.