Please choose the correct ending to complete the given sentence: Health: [header] How to get in shape fast [title] Set an aerobic goal. [step] Getting in shape quickly is a vague goal. It mostly includes a desire to get in shape both aerobically and to build muscular strength.

Ending1: To get your fitness up quickly, set an aerobic goal of getting up to the gym five to ten times a week. [substeps] Begin your workout on the treadmill. Ending2: According to the american academy of bodybuilding (ect), working out 150 minutes a week and 3 times a week for 7 to 10 years can help your body to grow. [substeps] Understand that many athletes are unable to complete a fitness level until their first years of training. Ending3: [substeps] Start by setting an aerobic or cardiovascular goal. Make sure to be specific and realistic with your goals. Ending4: However, it shouldn't be so vague or mentally daunting that you fail to even be fit enough to do it, no matter how close you are to becoming an athlete. [substeps] You should motivate yourself and focus on being physically fit with these goals and commit yourself to building muscular strength.

Answer format: ending1/ending2/ending3/ending4