Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to maximize fat burning during cardio workouts [title] Learn how to monitor heart rate. [step] You want to make sure you get a good heart rate for burning fat during your workout. A steady heart rate will allow you to work out for a long time more comfortably, giving your body the ability to burn fat while you're exercising.

Ending1: Find an app or other way to monitor your heart rate. [substeps] Try steeping vegetables if you're having a craving for salty snacks. Ending2: [substeps] There are several ways to monitor heart rate, such as by listening to the ticks in your heart. If you hear a tick or a beep during workout, make sure that you're breathing properly before you workout. Ending3: Before you can figure out a target heart rate for exercise, learn to measure your heart rate. [substeps] Place your index and third finger against your neck. Ending4: An irregular heart rate will lead to shortness of breath, high blood pressure, heart palpitations and decreased blood flow. Starting at the top and working your way down is key to getting your heart rate as stable as possible during cardio.

Answer format: ending1/ending2/ending3/ending4