SUMMARY: A decent workout over about 3 miles.
We hiked the Los Gatos Creek Trail from downtown Los Gatos to the Lexington Reservoir dam. My pedometer was seriously confused and registered only a mile, but it's roughly a mile and a half one way. So, in 50 minutes, I covered about 3 miles.
It's a gradual uphill on a smooth, wide, unpaved trail running along the Los Gatos Creek and just below Highway 17 (which you barely notice is there). Nearing the dam, there are a couple of short, moderately steep uphills, and then the final climb alongside the dam is also moderately steep. I had just reached the base of that final climb when time ran out and it was time to turn back, but I walked up about halfway to meet the farthest person coming down and we walked briskly together back to our starting point.
We did a few quick warm-ups before setting out. Drill Instructor encouraged us to jog, and some of us did some on our way up (I might have been able to do more if I had remembered to take a hit off my inhaler before starting), but as far as I know only one person did any jogging on the way back. My legs were getting plenty of a workout. On the way up, talking was possible but with an effort; on the way back, talking was a bit easier but still not gaspless. So the cardio workout was pretty good either way.
I've walked this trail below Los Gatos and above the dam on various occasions, but somehow never this stretch. It's a lovely walk in the woods most of the way, then out in the open along the creek canyon before the dam. I'll have to do this one more often.
Also, I could probably take my snapshot camera and get a couple of pix next week.