Keanu Soto, Kettlebell & Nutrition Specialist, CSCS, CPT, MS on Instagram: "Spinal Engine Theory is the practice of training your abs, core, obliques, erectors, and hips. By strengthening the muscles that surround and support your spine, you’re able to generate athletic movement in a more natural way—head over foot instead of static and stiff. This type of training teaches your body to stay strong while slightly off balance, which is exactly what happens in sport and real athletic movement. It’s