Earlier today during PE I jumped off the stairs about 1 - 2 meters and slipped towards the end of the stairs landing on my right elbow , right knee and hip . Nowabout 10 hours later my shin has a small bruise / lump on it and it hurts to walk . Applying pressure to it stings a little and I was walking a moment ago and fell to the floor because of a sudden pain in my right hip .

Question: Why may the narrator have injured themselves ?
Answer: They were careless while cleaning the house .They were sloppy with their exercise .They banged their elbow moving things .Their elbow got hurt because of poor lifting technique .