Fitness 30 Minute FLAT BELLY FAST Dumbbell Workout for Beginners Scott Admin posted on 2 years ago — updated on 1 second ago 221 views You will love this flat belly fast dumbbell workout for beginners. It targets all muscle groups, allowing you to lose belly fat fast. Brian is using 5lb dumbbells. Use whichever weight you're comfortable with. fitness abs workout weights Brian Syuki Scott Follow Author, educator, musician, dancer and all around creative type. Founder of "The Happy Now" website and the online jewelry store "Silver and Sage".