Alex we can teach you. I just posted a video in the equipment section of some quick shots taken at vertical practice on Friday. They aren't training quality by any means but gives an idea. Eventually our cave rescue team has been meaning to make some training videos for when we teach SRT courses. I have a feeling I will be delegated to that activity now that I have an idea how to use the recording on my camera better and have the editing program figured out!
A chest roller works very different from a croll. Completely unalike. I started off on a frog system (your standard frog system, that part is synonomous!) and being shorter and very topheavy with a shortish torso, this makes it completely uneffecient for me and I max out around 100-120ft of climbing. If I trained a TON i could build up more muscle I'm sure and stretch that, but I would never be able to do the big stuff, and it would be hell, not enjoyable. I basically caclulated even with a ton of practice my max would be at most 200-250ft, which doesn't get you into much here. It was a great system for Indiana and Kentucky, where I was doing little in-cave stuff and nusance 30-60ft entrance stuff. That's about it.
When I added a pantin to frogwalk (which I believe is where you call it a ropewalker, hahahhaha) this helped make it easier, I could do the 100-ish ft stuff instead of just around 60 or so, but the mechanics are still totally wrong as being so topheavy i'm walking at like a 45deg angle not straight/almost straight up!
Traded the pantin for a cmi foot ascender, purchased a chest roller, and re-tied my system into a single bungee ropewalker and bam...I'm climbing 600ft with ease.
I think sometimes guys have a harder time understanding just how much boobs can get in the way...especially 36DDD/F's >_> The weight distribution in my body is so CRAZY different between that and having hips. I'm carrying at least an extra 30lbs of weight in my upper half than I would if I was a male version of me. Even looking around at the rare other female who does srt here...95%of the time they are very masculine in build.
A note about passing rebelays and such though - I can't comment on a mitchell (never tried it on that system) but there are a few guys here (usually tall sticks of guys) who prefer frogging (and it's funny to watch them try to ropewalk, it's the rare body-completely-built-for-frog they have!) and past few vertical practices we've done rebelays varying in crappyness of rigging. the one that was like 10ft down, 10ft over to the rig point and very shortrigged (rope stretched downward gave about 6" past the rebelay, there was nothing to rappel into!), I was a bit slower on climb, and much slower on rappel (rappel slowness due to not having something that short on me as I didn't have cowstails so I had a hell of a time figuring it out!). All the other rebelays I was basically as fast as the froggers. And to be honest everyone struggled with that one rig...I just hope I never run into one of those in a cave. LOL