I've been using Full Fitness for several years. It was by far the best app for tracking weight lifting progress and has until now been pretty damn reliable. Today, at the start of my workout, I opened the app and found it had been updated. I was welcomed by a new screen that prompted me to enter my weight, height, goals etc etc as though I was setting up from scratch. When I got through this I discovered to my horror that all my previous workout data was no longer there: everything was blank. There was no history to speak of. Much cursing ensued. I am going to have to restore my iPhone from a backup to retrieve my workout data, write it down and start tracking my workouts the old fashioned way, on paper, as I'll never by fully confident that the app won't erase my data again in the future.