I enjoy interval type training (bursts of high intensity alternating with rest) because it closely matches "cadence" of hockey shifts - you skate hard for about a minute, then rest for 1-2.5 minutes. While indoor options also work, it's more fun to get outdoors.
I've been to Edgewood a couple of times and really like it. The incline is not overly steep to run up and it doesn't hurt your knees on the way down. There are short loops between one to five miles. My first time I intended to do a modified version of Trailstompers Big and Small Loop but took a wrong turn and my increased my intended 3m trail run to about a 5m one. This weekend, I did the Sylvan Loop, a 2.5m route which can be done without a huge time investment while still getting a good interval workout.
Quick note on Sylvan Loop - head over to the trail head near the wire link fence. For a more difficult start, head right on the Baywood Glen Trail for a series of 6-7 switchbacks and steeper incline.
