Thanks John, but to be accurate that wasn't a 360 side slide. Maybe a 200 or so.

A 360 side slide on long lines that is low and slow, takes a lot more stamina than I've got. I can feel the burn in my legs as I think about walking backwards up that hill.
Funny thing about side slides and 360's is that you don't actually do anything other than walk backwards. If there's little to no wind, you should be able to virtually lock in in and go as far as you want. I'm not sure why that's so hard. When the kite is up wind I feel like I'm going to panic. "Pleeeeease baby, don't die on me........"