This concept reminds of how Shiva Rea approaches core work. Rather than doing basic crunches, she has you explore lifting and swaying your torso and legs in creative, dance-like ways. It may seem a little weird to have such free and seemingly unintentional movements, but they're actually really effective. It keeps your muscles guessing, and the varying movements end up targeting every part of your muscle. This technique can be used with just about any dumbbell or resistance band exercise. I recommend using a lighter weight or tension as it doesn't take much to feel this type of movement working, and you don't want to risk injuring yourself.