Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to define abs [title] Do cardio. [step] Although cardio doesn't necessarily define abs or tone them, it's an essential part to losing any excess weight or decreasing any pesky fat that might be hiding your defined abs. [substeps] Include at least 150 minutes of cardio each week.

Ending1: The more you do this, the faster your muscles will get accustomed to it. You should do about 150 minutes a week. Ending2: Exercising can help tone your abs if you exercise regularly to burn fat. This includes regular physical activity, such as running and biking, swimming or cycling. Ending3: This is the minimum amount that most health professionals will recommended. However, if you are not seeing results or want to see results quicker, you may want to consider increasing your cardio to about 300 minutes per week. Ending4: Increasing your cardio regimen can help ensure adequate muscle tone (usually visible at the midsection) and even improve your muscle performance. If you're looking to lose weight and have an eating disorder, always eat safe, healthy foods, as these will help your weight gain.

Answer format: ending1/ending2/ending3/ending4