Hellman Park is a short hike in Whittier that offers a great workout with a steep and steady incline. The trail overlooks the city and is great for sunrise/sunset photos.
This trail is great if you're looking for a quick, but intense workout. The hike itself is only 4 miles out- and-back and can be easily completed within a couple of hours. However, be prepared for a steep and steady incline for the first 1.5 miles.
The trail itself is pretty wide, and if you show up late, parking will be an issue as it is a popular trail in the area. There is a small lot open right next to the trailhead, but street parking is also available.