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

Context: The plan was that H , V and I were going to stick together and ride it at a casual speed . We did just that , rolling along the trails at a good speed , overtaking people from time to time on the uphills and going moderately on the downhills . The trails were great . Not too difficult , but not too easy .

Answer:

A bicycle .



What were they using to ride the trail ?