5 Most Effective Abdominal Exercises

This document provides instructions for 3 levels of abdominal exercises that can be performed on the floor or using an exercise ball. Level 1 exercises are easiest and focus on basic crunches, leg lifts, and bridges. Level 2 exercises add movement like bicycles and planks. Level 3 exercises are hardest and involve complex motions like crunches with arm movements. Rest periods of 60-90 seconds are recommended between each exercise. Safety advice is given to consult a doctor before starting and to stop if back pain occurs.