One of my favorite trails to exercise. This is a special trail because it is accessible and close to Palmer. It is a great workout up to the River.
If you go up the actual Mat Peak Trail (verge left a little ways right before the steep hill) you can get a fun wooded trail hike and then at the overlook to see Pioneer Peak and the Butte you head down on a little connector trail
But, it is also my favorite way to go to Matanuska Peak. At the river, you head to the trail that follows the river. It is more straight up because there is limited switchbacks. The river is noisy and it can get overgrown easily.