Some people were angry about this trail when it was first installed in 2016. It's 3.1 miles of crushed granite, with several concrete drainage support structures, slicing through a wide swath of the 1,500-acre Papago Park. In the end, it's worked out as a multiuse trail, allowing for easy hiking, jogging, and cycling. (We've even seen off-road-style wheelchairs on the trail.) The park is situated conveniently on the borders of Phoenix, Tempe, and Scottsdale, and the trail has become one of our favorite features in it. The Fitness Trail is the perfect place to train for a 5K — well, you said you like hills, right? This ain't no sidewalk jog. Start at the West Buttes parking lot off Galvin Parkway, just west of the Phoenix Zoo. The trail rolls like a gray ribbon across pink, cactus-covered hills, never flat for too long, but with nothing steep enough to blow out your knees. Up and down, twisting and turning, taking you the long way around the golf course but always west of Galvin Parkway — it all adds up to a deliciously full workout, like eating half the leftovers as well as the main meal. The next time you do a flat 5K, it'll feel like a snack.