Выберите правильный вариант. Прошу помогите


Choose the correct option.
1 You must always warm (out / down / up)
before you start any exercise.
2 My brother usually works (in / out / by) at the gym at least twice a week.
3 Our best team was knocked (in / out / down) of the competition in the first game.
4 I first took (with / for / up) swimming just to get fit, but now I enter competitions.