Thanks Jason, just what I wanted to know. I've read through a bunch of the threads in the injury section as well. There's a lot of good information to be found. I haven't seen anything about side-to-side stability. Imagine rolling your ankle, that kind of sideways movement. If the lower leg is fixed in the bock, the next thing to give would be the knee and there's a huge arm for some good leverage on that joint. Perhaps this isn't a concern, it's hard for me to tell, but how do they feel with regards to inward (or outward) buckling? I saw a video that looked like what a baby deer or cow looks like at birth - knees kind of inward and feet outward, making kind of a ^ shape from the knees down. It seems like that would be killer on the joints, but you have to be doing something wrong to end up in that position I suppose.
Charlie B, thanks. Good to know. I suppose it is more of a bound than a jog or run. That's a good point too, pushing past fatigue is a bit dangerous because of the increased chances of getting sloppy and tripping up.
Thanks!
-H