That's funny. I picked up those course markings, and my left inside thigh was strangely sore afterwards as well! Maybe it's from reaching high.
My soreness was basically from doing squats all day long with a backpack on. Squat down to put pinflags in, squat down to hammer, etc.
The only other time I carried this much while course-marking, I also had a bunch of orienteering markers (it was the double trail run + orienteering meet at Lord Hill in July). That time, I had to take off my backpack each time, but this time I didn't.
Yeah, Eric critiqued me on placing the clothespins too high! This was my 5th time course marking, but the first time I'd heard this criticism before. Sometimes I find that it's hard to "obviously" hang them on the sides of the trail, so when I find a really nice overhanging branch, I put them smack over the trail so that they are right above people's heads.
Eric says that a lot of trail runners don't look up (as often as orienteers), so perhaps my idea isn't as good as I thought.
Hmm, I thought that Eric liked overhead streamers-- but they should be low enough that it might almost/actually brush a runner's forehead.
Though I couldn't hang a streamer too high even if I tried. ;)
I can reach up and touch an 8-foot ceiling, so the highest streamers are being clipped at around 8 feet high. If you assume that a streamer is about a foot long, then the lowest part is around 7 feet high, which won't brush anyone's forehead. These are probably about 1 foot too high.
But streamers on the side of the trail also don't hit people in the face, so I don't know how important having streamers in-your-face is!
There were some directly overhead. While they didn't actually brush my face, as you approach, that look like they might be that low, so yes very visible, but once you get there the streamers were plenty high / clear. I'm a fan. They are mostly seen from a distance when glancing down the trail, because they're smack dab in that space you're looking ahead to. So, while I agree trail runners spend a lot of time looking at the dirt closer range, they'll see those streamers mostly when they glance up for the long view, rather than short view.
I didn't find any of them too high to reach, I could always grab at least the streamer, and just tug it down. I sometimes get a branch to the face, when the branch comes down with it, but that's ok.
Maybe my soreness was from squatting. It was kind of weird, gone now.