Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: The field was mainly club runners in colours ... Calne were present , as were White Horse Runners , and Chippenham Harriers . There were proba bly only two or three non aligned runners , one of whom was accompanied by Charley the dog I 'd bumped into several people I knew before the off , and despite being a " clubby " race it was very relaxed and friendly . And I was proudly sporting my new birthday present , the tri suit . I 'd warmed up on the treadmill in the gym as it was convenient , with a kilometre to get me sweaty .

Question: What may be the reason for their treadmill warm - up ?
They wanted to do well in the run .
Convenience.