Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to relieve stress with running [title] Enjoy running. [step] Above all else, running must be something that you like to do. It won't relieve stress to simply take up running because you think it might help but you can't stand it as an activity.

Ending1: Think about it: if you already enjoy running, running will just make you think you're doing something you shouldn't, which could stress out or even throw you off. [title] Start running after you've had enough rest. Ending2: [substeps] Start off by running for about 90 minutes, but only for one hour or less, three days a week. For example, a week of half an hour four days a week would be sufficient for you. Ending3: Once you begin to enjoy running as a form of exercise, you start to realise that it can affect you much more than your physical body. [substeps] In order to build power as a runner you need to be able to burn the form energy you build. Ending4: Find a different physical activity if running pains you. On the other hand, if you love running and how it feels, make the most of it as a stress reliever.

Answer format: ending1/ending2/ending3/ending4