That's cool. I've seen it used in some boxing training footage, and that seemed like the general idea. I'll talk to my friend who runs the gym, and see if they could put an anchor in somewhere. I'd really like a free-hanging heavy bag too. Right now they only have them on stands, and it's a little sketchy throwing kicks from certain angles. I wish I didn't sell my Wavemaster, or I'd just bring that down.
I definitely prefer the heavy bag for overall work and use that at least twice as much, but the speed bag is fun. I always thought it looked really cool too, so I'd like to get really good at it. I did it tonight for a while, but I did a decent shoulder workout beforehand. That definitely isn't a recipe for a good speed bag session haha.