Based on the context and the answer, generate a question. 

Context: So everyone , in mid run , turns to the side and kind of ninja runs in the circle . I am good at this - it is n't hard , but I noticed some people keeping their feet closer to the mat than I , and so I kept my step low to follow suit . I failed . I tripped over my own foot and stumble for a good five or ten seconds to regain my balance since I was bent over running with my arms flailing .

Answer:

Bruises



What kind of injuries would be sustained ?