Time permitting we create our own. However, to save time and share the knowledge below are reviews we like.
iFitness for iPad – http://www.padgadget.com/2010/08/01/ifitness-for-ipad-app-review/
PadGadget App Rankings Top 200 Free Apps: http://www.padgadget.com/ipad-apps-tracker/?o=1&t=1&f=100