Andrea wants to improve her flexibility. she is already doing flexibility and strength-building exercises during her workout. which type of exercise would not complement andrea’s present workout very well?
biking
cross-country skiing
swimming
weightlifting

Okay so, Andrea is wanting to improve flexibility. The question is asking what would NOT compliment her present work out. She is already doing flexiblity and strength buliding exercises.

Biking- This is a cardio exercise and will work on her endurance 
Cross Country Skiing- I am not really sure what all this has to deal with but I assume cardio and strength buliding
Swimming- This is as well a cardio and can be for strength training.
 Weightlifting- is a strength buliding exercise.
 
 I am going on a whim here, but I believe the answer is Biking because biking is the only one that is normally only used as a cardio exercise, and Andrea is wanting to improve her flexiblity.     

Major sources of stress, such as a death or divorce, problems in family relationships, job loss, school, and substance abuse, can trigger or aggravate some mental disorders in some people. but not everyone who goes through those things develops a mental illness