Krystal leads this 15-minute core crusher targeting your entire midsection with dynamic movements and isometric holds. This efficient workout combines weighted sit-ups, rotational exercises, and plank variations to strengthen your rectus abdominis, obliques, and deep core stabilizers. Perfect as a standalone session or stacked with other workouts for an extended training day. Equipment needed: • 1 dumbbell (8-12 lbs recommended) • 1 yoga block (or substitute with a can, phone, or any small object)