❌ You’re Training Abs WRONG One of the most common mistakes in ab training is keeping your back straight. But one of the abs’ main functions is to curl your spine. To truly engage your abs, focus on curling your upper back during exercises like cable crunches, sit-ups, decline sit-ups, and even planks. For lower ab movements like leg raises—on the floor or the captain’s chair—tilt your pelvis and round your lower back. That spinal flexion is what actually activates your abs. Size & Shred Trainin