5 ab-sculpting workouts that can build core strength in the gym, according to personal trainers - Yahoo Sports

Gym machines can help you build strong ab muscles with weights and resistance more efficiently than bodyweight crunches, according to trainers.

Maximise your core strength with one dumbbell and this standing ab workout

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I'm a personal trainer — sculpt core muscle with 3 ab exercises and one dumbbell in just 15 minutes