Back in the day there was actually a popular workout called, “Abs of Steel.” However, why should this metal take a backseat as something to be compared to when it involves the core muscles? And why is the kettlebell really not a good option for this shoulder mobility, core strengthening exercise? This week Cory and our FLD intern, Abbie, breakdown how you can have a more effective strength training experience using the Ultimate Sandbag over kettlebells for your next ‘Abs of Copper’ workout!