Bull Run is a fun downhill trail in the Magnificent 7 / Gemini Bridges Trail Complex.
Bull Run has a parking lot on the Little Canyon / Gemini Bridges Rd. It's a 5.5 mile downhill trail that ends at the Lower Getaway Trail. Bull Run Trail follows the north side of Bull Run Canyon and provides scenic views with a mix of slick rock, sand, and flowing trails.
Most people will park at the top parking lot of the Mag7/Gemini Bridges Trail Complex next to Highway 313. From there, most people ride down upper Getaway, then jump on Bull Run and take that down to Lower Getaway. Getaway is a mellow climb back to the parking lot.