Please choose the correct ending to complete the given sentence: Youth: [header] How to get in shape as a teen [title] Start slowly and build up. [step] Try to take a ten minute walk every day after school. Add a minute every day until you're walking for an hour every day.

Ending1: You can also take a 10 minute run over the weekend. Get more exercise by building up your range of motion. Ending2: Exercise twice a week, or whenever you get tired. You may not make it that long, so take it slow and keep adding every few days. Ending3: If you don't have a safe place to take a walk, try climbing stairs instead. Walk up and down the stairs five times on the first day, and then add one more flight of stairs every day until you can go up and down twenty times without stopping. Ending4: Do something fun each day, such as taking a few yoga poses, playing a game of truth or dare, going to a movie, watching a show, or going to the library. Join a weight lifting program, if you want to.

Answer format: ending1/ending2/ending3/ending4