She starts vigorous training

Maria takes her friends' advice about losing weight seriously. So, she decides to start training vigorously. 

She buys a bicycle and enrolls in a gym for high impact aerobics. Apart from these, she takes up jogging 3-4 times per week. One day she has an accident and ends up in a hospital. She is diagnosed with a torn ligament, probably due to her vigorous training according to what the ER doctor says. 

She needs to take it easy, stop training for at least 2-3 weeks and resume her activities with low intensity activities so that she will not hurt herself again.