What is your favorite application on the iphone to help clients assist in weight loss?
There were some great Apps suggested in this question as well https://www.ideafit.com/answers/what-is-the-best-foodnutrition-tracking-a…
Have you tried ChallengeLoop? http://www.challengeloop.com. The app allows you to motivate your clients to achieve their fitness goals and track their progress along the way. It is both an iPhone app and website.