Edit this sentence to make it grammatically correct: Running at top speed, he tripped and broke his leg.
Running at top speed, he tripped and broke his leg. (The sentence is already grammatically correct.)
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit this sentence to make it grammatically correct: Running at top speed, he tripped and broke his leg.

### Output:
Running at top speed, he tripped and broke his leg. (The sentence is already grammatically correct.)