If you want to track your weight with BMI and BF% (neck, waist, and hips) this is a good app for that. No bells and whistles. No app syncs. It took a minute to try an figure out where to go to input info and where to track info. Simplistic design is fine but its not very strait forward. If you want a more in depth app (as far as tracking more body measurement) try iRecord Weight which is also sketchy about how difficult it is to enter information.
Zadorians about Weight Recorder