Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to improve your effectiveness at running back in football [title] Get into the weight room. [step] Using weights helps with speed, agility and power. Do significant work-outs around 3-5 times a week.

Ending1: Don't make eye contact with your teammates. [substeps] Make a point to be at the back of the field in all games and motions. Ending2: Anything more could end up hurting you more than it does help you. [title] Practice several times a week on drills and basic exercises. Ending3: You can do leg lifts on non-reactive days and heavy-weights on an alternate or a combination. For instance, have your teammate kick each leg as high as possible. Ending4: The rest is up to you! [substeps] For maximum strength and stamina, wear knee pads if you have them. Try to make sure they're not heavy or uncomfortable.

Answer format: ending1/ending2/ending3/ending4