Maybe it's proprietary and not in the FIT SDK spec but the firstbeat "performance condition" status is kinda useless without a baseline?
I've noticed the watch can literally change vo2max in the middle of a run and you'd never know until you look at the PC and new vo2max afterwards.
By the way garmin if you are listening, you should make a display field option not just for "performance condition" but current vo2max + pc
ie. 54+2
instead of just +2 (which is far less useful)
