Here is video of some local bike riders who frequent the Mission Bike Trail. You'll witness a few falls, but that's to be expected from mountain biking. The point is, they had a good time.
The hike and bike trail started off as the Mission Nature Park, which it still is officially. There were trails made by illegal aliens that bike riders used to frequent. After the bike riders expressed a desire for the City of Mission to develop the trails, the city paved about 5 miles from the Nature Park to Bentsen Park. It was a great job. Unfortunately, many of the existing dirt trails were torn up in the process.
Over time, and with some work, bike riders have made new trails and found new places to practice their mountain biking within the park. Enjoy the video.