A simple rotation of the sandbag (or kettlebell, if no sandbag is available) while descending into a reverse lunge will challenge your strength and core stability in the transverse plane.
When you add in the power of a swing, what you wind up with is a really cool explosive movement – the swing requires decelerating the implement at the bottom of the movement before you explode from the lead leg into hip and knee extension.
Earlier this year, Dr. Lonnie Lowery wrote an article called 100 Workouts From Ripped City, which promoted light to moderate morning cardio for fat loss. It caused a stir amongst Testosterone contributors who'd been touting interval training as the supreme fat loss workout.