BOSU Terrific Torso Personal Training is available at Bellingham Athletic Club BOSU Crunches CRUNCHES & EXTENSIONS 2 - 3 sets of 15 - 20 repetitions BOSU Back Extensions BOSU Lateral Crunches BOSU Iso Planks BOSU Lateral Iso Planks ISO PLANKS 2 - 3 sets of 15 - 60 seconds