@sub7
currently using iFitness at the moment. pretty good app, helps me keep track with my progress. plus, i tend to forget exactly how much weights i used in my previous workouts, so app's ability to log your weights/reps/sets is fantastic.

on a totally unrelated note:

discovered this application: iPhone Explorer. http://www.iphone-explorer.com/
it's not an App store program and it's totally free. with this you can transfer any files to your iPhone via the USB cable. so you can now make your iPhone double-up as USB Disk Drive.

pair this up with another free app from App Store, FileAid, and you can now have file transfers BOTH over WiFi and cable. Since FileAid is paired up with DiskAid, as recommended by FileAid's developers, and DiskAid is shareware, you can just use iPhone Explorer as a FREE & LEGAL substitute to Diskaid.

Using iPhone Explorer, just transfers your documents to the same folder as DiskAid / FileAid, and you can now view your documents on your iPhone using FileAid.